Welcome of the world of Chinese produced clothing.
I've worn a 10 1/2 E shoe as long as I can remember (20+ years out of high school.) I haven't tried on shoes for that long. Just got a new pair of shoes, 10 1/2 E, and they are way too narrow.
I've worn Levi jeans all my life, since at least 3rd grade (nearly 30 years ago.) When Levi sent their production overseas, all of a sudden, they were way too tight in the, and I'm not trying to brag here (I'm a guy....), crotch area.
30 years of Levis fitting perfectly and now I had to hunt for a new jeans company because everything I tried was too tight in the same area. Ended up with Arizonas from JC Pennys.
Shorts are the same way. Never had a problem until a few years ago. Now every pair of shorts I try are too tight, same area. I'm definitely not getting any bigger there, but all pants/shorts are the same. I buy all my shorts Arizona brand now as well as what few dress pants I have.
T-shirts. I have been wearing a 2X Large for years and years and years. I like them pretty loose and easy to move and twist around at work. I buy 5 t-shirts off at the same time, in the same store, off the same shelf all in 2X large and 2 shirts would fit and 3 would be way too small.
Oh, and before it is said, I am 230 lb. and have been the same for at least 15 years + 2-3 lb.