Indeed. When I was a teenager, BMI between 19 and 20, I generally wore a 29 waist in the guys section and a 9-11 in juniors, 10-12 misses, depending on brand, cut, time of the month, etc. A size 6 wouldn't have stretched from one iliac crest to the other if I held it up in front of me. Now, mumble, mumble, decades later, with a BMI of 23.5, I just got some great fitting, straight, not skinny, jeans at Old Navy - drumroll please size 8 regular and size 6 "curvy."  W.T.F?  It's not just them though. These days, if I'm shopping skirts, I start with the 8s. More often than not, they fit. They shouldn't. This is nuts.