I just bought a swimsuit for the first time in over a decade, and learned that there is no size inflation in swimsuits from Speedo. Luckily I brought in a TYR suit to try on - Medium is about right, and it fit.

I've been surprised and disappointed to find that there is size inflation in some brands of athletic clothes. I don't even care, as far as other things. Sure, I have size 12 clothes that still fit me when I buy 6's or 4's now.