Here, here!
It drives me insane when I go shopping with DH. He'll pick up a size M and throw it in the basket. "Aren't you going to try that on?" I ask. "Why?" he responds. "It's a medium." And the kicker of it is.....he's right. It all fits him.
I have to try on EVERYTHING. I range from size medium (LL Bean and Cannondale) to extra-large (Castelli), depending on not only the manufacture, but the style (and even model year??). I have a pair of women's Gramicci pants, size M. They fit me fine. I go back to the store, I can't get a single pair of Gramicci pants in size M over my hips. What the heck happened?? I still wear the old ones and they fit fine.