Wondering if you should wear an undershirt under your t-shirt? Here are the top reasons to consider whether or not you should (or shouldn’t).
The writing of this article was inspired by this reader’s question:
Your site is awesome, so you were the go-to guy when I ran into the issue of wearing undershirts under t-shirts. I like to wear an undershirt everyday under whatever I have on, as considering my job it’s usually something collared (depending on what’s needed, polo or dress shirt or whatever).
But now it’s summer, so I’m wearing t-shirts. It’s not exactly easy to wear an undershirt under them.
I feel really gross with the sweat and everything without one, and it just looks kinda weird to wear a t-shirt under a t-shirt…doesn’t it? Any suggestions?
Thanks for your help!– Peter
Firstly, let’s define the difference between the t-shirt and undershirt. Often confused with each other, the undershirt and t-shirt are, in fact, two completely separate items of clothing with different purposes in your wardrobe.
The UNDERSHIRT is a base layer shirt worn next to the skin. Its function is to minimize the everyday sweat and underarm deodorant stains from soiling your dress or t-shirts, helping to minimize the number of times they need to be laundered and therefore extend their life.
The undershirt is actually not a shirt, it is underwear. Just as you wouldn’t go outside in your jockey shorts, you should not be wearing an undershirt as your outermost item of clothing.
The undershirt is made to be worn under another shirt, so it is thinner and lighter than a t-shirt. It is available in a limited number of muted colors such as white, grey, black and tan so as not to show through your outer shirt.
Undershirts are usually worn under a collared work shirt. They also give you an extra layer of coverage under a lighter fabric dress shirt, thus avoiding that embarrassing see-through look.
Undershirts are slightly stretchy with a snug fit and are not made to be worn on their own.
The T-SHIRT, however, is worn on the outside exactly like a normal shirt.
It is thicker than an undershirt and comes in a variety of colors, fits, and collar styles — absorbing sweat like any other shirt. For sake of clarity, unless otherwise noted, I’m referring to crew neck t-shirts most of the time in this article. Crew neck t-shirts are those with the round collar (Wikipedia).
For those looking for the best selection of t-shirts that have close fitting collars, be sure to check out my tight neck t-shirts article.
Undershirts and t-shirts are not interchangeable, however, so it is not advisable to wear a t-shirt as if it is an undershirt. This is because, under most circumstances, it will bunch up and show visible lines through your outer shirt. Not a cool look and probably a little uncomfortable too.
T-Shirt vs Undershirt?
Looking for more information on the differences between undershirts & t-shirts? Check out my T-Shirt vs Undershirt article covering the top ways they are different.
Should you wear an undershirt under your t-shirt?
Now that we’ve defined the difference, should you wear an undershirt under your t-shirt – or even golf or polo shirt?
The answer is both YES and NO.
Can you wear a t-shirt without an undershirt? Sure, many do — and it really boils down to personal preference & comfort.
Should you wear an undershirt under your t-shirt? Absolutely, especially if you want to add extra life to your outer shirts.
Here’s why it’s important to wear an undershirt even under your t-shirt:
Protection from Body Sweat and Odors
Wearing an undershirt under your t-shirt prevents the armpit areas from becoming stained and stiff from sweat and deodorant staining.
It will extend the life of your t-shirts as they will need less laundering.
Stays Tucked-in Better
The typical T-shirt cut is very short and won’t stay tucked into your pants all day.
Undershirts are cut longer than your average t-shirt, so they stay tucked into pants or shorts and provide a more pulled-together look.
Protection from Stiff or Rough Fabric
An undershirt is comfortable and soft and can protect your skin from an itchy or rough fabric.
If your current undershirt isn’t soft, you are wearing the wrong type.
Makes White T-shirts Less Transparent
Light-colored t-shirts can be transparent. With a little sweat or water, they can become embarrassingly see-through.
Wearing a good-fitting undershirt underneath a light-colored t-shirt ensures a solid visual barrier which will absorb the sweat that may have made it transparent.
Streamlines Your Appearance
Undershirts help smooth out your body contours.
Nipples, man boobs, or chest hair peeking through your shirt can be somewhat of a fashion faux pas. So, a well-fitting undershirt that contains a little compression will help reduce the appearance of any unsightly characteristics of your physique.
Helps Regulate Body Temperature
Not only can a good quality undershirt feel good against the skin, but it can also help regulate body temperature.
Today’s undershirts will either keep you warm in the winter or cool in the summer. A thicker undershirt helps you stay warm in the winter and a breathable, absorbent shirt to wick the sweat away helps your body temperature remain stable in the summer.
If you are wearing your favorite t-shirt on a warm day, be sure to add an undershirt with a cooling fabric underneath to keep you comfortable.
What fabric should you choose for an undershirt?
Here are my suggestions –
- Undershirt fabric should be thin, stretchy and soft
- If prefer cotton, choose high-quality, extra-long staple 100% cotton such as Egyptian or Supima cotton
- Another option is a stretchy combination of cotton and synthetic fibers (such as rayon) that retains its smooth shape
- Modern technical fabrics, such as TENCEL are buttery-soft with sweatproof or moisture-wicking properties
What undershirts styles are there?
Undershirt style options include:
|Sleeveless; doesn’t absorb underarm sweat making its main function to absorb sweat on chest & back, hide nipples and smooth down chest hair.
|Wear this with v-neck tees so you can be stylish without your undershirt peeking through.
|Wear deep v-neck undershirts when you’re wearing any open collar shirt (polo, button-up, dress shirt) with 2 or more buttons unbuttoned — showing more chest.
|The most common style to wear with a typical standard tee, or when wearing a tie.
|Long Sleeve (crew neck usually
|Great for warmth or to cover arm tattoos.
|Best for smoothing the appearance of lumps and bumps. See my Compression Shirts for Fat Guys article or my Shapewear category for more information.
For those looking for crew neck undershirts that have good sturdy, no sag collars, check out my list of tight neck undershirts.
What Should I Know About Undershirt Fit?
Your undershirt should be close-fitting with small armholes to allow it to absorb sweat under your arms. When an undershirt is fitted, it helps prevent bunched excess fabric underneath your t-shirt.
It should feel snug but comfortable, without restricting your movement – and should stay tucked into your pants.
Also, make sure the neck opening is bigger than your t-shirt collar. This will prevent the collar from bunching around your neck or peeking out from under your t-shirt.
A carefully crafted, quality undershirt smooths out the torso, so your shirt lies flat across your body.
What Should I Wear Under A V-Neck T-Shirt?
Generally speaking, you should never let your undershirt show.
When wearing a t-shirt with a lower neckline, such as a v-neck t-shirt, wear a thin, close-fitting v-neck undershirt so that it isn’t visible underneath.
Two v-neck styles to choose from:
|When To Wear
|Regular v-neck undershirt
|These are best for wearing under a v-neck t-shirt or under a shirt with the top button not fastened. Note: Sometimes called high v-neck undershirts
|Deep v-neck undershirt
|This style works best under a deep v-neck t-shirt, or of course, a button-up shirt with the top two buttons left unbuttoned
Should I Wear A Tank Top Under A T-Shirt?
Tank Top undershirts can be a great option to wear under your t-shirt, especially in the summer or hotter climates. See my article about Wearing Undershirts In Summer for more specifics.
They have less coverage than a sleeved undershirt, so they can sometimes be cooler to wear. But, they do a good job of absorbing chest and back sweat, keeping your t-shirt cleaner than if you weren’t wearing an undershirt.
Additionally, most tank top undershirts are fitted, so they offer some smoothing & shaping, chest/nipple flattening, and can help your t-shirt drape better.
Lastly, if your t-shirt is a little coarse, a tank top undershirt will help prevent nipple chafing and will generally provide more comfort than going without.
The Bottom Line
The undershirt should be a staple in every man’s wardrobe and can be worn a t-shirt if done properly.
It’s practical, comfortable and preserves the life of both t-shirts and dress shirts alike.
Try one on, wear it for a day or two, and you just may never go back to wearing your t-shirt without an undershirt under it.
This article has been updated, re-written, and republished. The original comments below have been maintained for historical purposes.