Funnily enough, men that lift a lot of weights end up having trouble fitting men’s clothing sizes as well. You get something that fits your chest, it won’t fit your waist (unless you’re a power lifter, where you tend to see less difference between chest and waist than in bodybuilder circles), and it may not fit your neck worth a damn. Buy for the neck size, your sleeves can be baggy.

It is even worse that that. There is plenty of variation in body types and how manufacturers design their clothes so that being fit or just slightly fat has less impact on whether something fits than whether they even design for your body type.

I tend to avoid long sleeves because I have lengthy gorilla arms, which hasn’t changed even as I’ve put on weight over the decades. Hard enough to find something that is long enough for my torso.