Ben O. sent in this picture from the store Wet Seal:
As Ben says,
…as long as your body is between XS and XL, or no larger than size 15. (For non-US readers, that’s a waist of no more than about 75cm.)
This might be useful for a discussion of which groups are made invisible in our society (who isn’t part of “everybody”), as well as the more obvious issues of the arbitrary division of clothing into “normal” and “plus” sizes.