Male or female, I'm fairly certain that many of us wear undershirts.
The standard designation for an undershirt has been T-shirt; though there are many varieties of undershirt available.
My preference for an undershirt is a muscle shirt. It is basically a T-shirt which has been cut off at the shoulder seam; it has more shoulder than an A-shirt.
The reason I started wearing muscle shirts was due to wearing dress shirts.
When I would wear a dress shirt, it was usually a simple white dress shirt; I usually wore Botany 500 shirts because they were easy to care for, mostly cotton, and cheap, comparatively.
One thing I never cared for in a white dress shirt was the look of seeing one's T-shirt sleeves through the shirt. I could reduce or prevent this by buying expensive, and difficult to care for, all cotton shirts; but that was an option I really didn't want.
Being that the muscle shirt cut off at the shoulder where the shirt seam was, it became a solution to the problem (yeah, most people probably wouldn't have cared). I just got use to wearing muscle shirts since.
It has generally been more difficult to find muscle shirts over T-shirts and A-shirts. I have seen several stores selling so-called muscle shirts; they cut off at the shoulder, but the damn arm opening extends half-way down the shirt.
I found a few today while digging through the Fruit of the Loom boxes at Kmart. Kmart has generally been my best source for finding the ones I like. BVD made some too that I used to wear, but are they still in business as I can't find them locally?
Do you have a preference of the undershirt that you wear?
For any particular reason, or is it something that you just got use to?
Do you prefer not to wear an undershirt?
No, I am not asking about your briefs; so please don't feel obligated to share that part.