We buy these mostly as undershirts, but sometimes as tees for hot days. As a result, sometimes we get plain cotton in white for my husband and in black for myself (a female), and sometimes a cotton poly blend. So far, we like all of them. I noted in the Gildan boxer brief reviews that someone commented on oddities of sizing both for briefs and tees common in most brands. In boxer briefs, the waist size "range" may be "42 to 44" for example, but the real waist size would be 43", which is the "mean". They speculated that since the tees are advertised as being for women as well as for men, but the chart basically shows chest measurements, women might find it difficult to make appropriate purchases. In reality, it just takes a little thought and understanding of one's own body build plus personal preferences. My husband, like many older men, has a bit of a tummy and prefers a fairly loose fit. He's 5' 9" and 195 lb. For his own use, we buy an XL. When buying a more body conscious tee from a brand such as "Into the AM", he's happiest in an XXL. When I buy a men's tee for myself, it is because most women's tees don't suit my body type. I hate cap sleeves, for one thing, and prefer a men's style. Most importantly, my largest dimension is my bust, not my hips. Women's tees that fit my bust have a heck of a lot of material at the hip to accommodate a "curvy" build, which in most women includes generous hips, thighs, and butt. I have an athletic build. My natural bust has the kind of shape most women only get with a minimizer bra, so although I'm about a 38D/40C depending on the brand of bra, when I buy men's tees, I'm very happy with a L. In most brands of tees, the men's tee falls nicely from my bust area and the tail doesn't cling to my hips or backside at all. In fact, I've been known to tuck the tee into my Gildan men's boxer briefs. After all, women's underwear tends to be scratchy, cheap, and made with the assumption that one's waist is 10" to 12" smaller than one's hips. While once true in my case, I'm in my 70s, and women's clothing manufacturers refuse to recognize certain facts of life. I generally wear pants, jeans, or joggers, which suit both my personal preferences and build and work well with men's boxer briefs and tees. I've also discovered that when I want a tee to wear as a tunic, I can buy size LT and wear it "tail out", since I'm relatively short. (BTW, the size L in boxer briefs fit me very well. I still have 36" hips, but my lower abdomen isn't quite as flat as it used to be, and my waist isn't 25" anymore. Women's bodies alter as they age due to hormonal changes, you know, just as men tend to lose muscle mass, their butts get flatter, and their tummies get the "father figure".) Now you probably know more than you want to regarding the fit issues for underwear and that sort of thing, but maybe all this will help a puzzled few.
Gary H