Celebrities seem to have developed a pants allergy. Bella Hadid and Julia Fox have been running errands in their underpants. Bodysuits, oversize blazers worn as dresses, and sheer fabrics that reveal the lingerie underneath are all common sights. This widespread pantsless trend has given rise to a new sort of garment, more micro than micro-shorts, bulkier than lingerie: I call it the “fashion diaper.” Its closest historical analogues are the hot pants of the 1970s or the bottoms of the two-