Anything smaller than size 8 unless she's a size 0 to start with Button-up shirts Suspenders what kind of girl wears suspenders anyways? You will be rewarded each summer as she swells up like a beach ball. There is nothing wrong with a fat girl going swimming. But what to wear for a suit? Typically, skinny girls demand that the wearing of bikinis be reserved to their kind, and that fat girls wear one-pieces. However, the reverse should be true.