Yeah I guess I go to a lot of parties where there are a bunch of cute cis guys and trans girls, and I find them all attractive. One thing in common with a lot of my friends is that we're all quite twinky/feminine in a way, so maybe that's part of what I find attractive (and what contributes to liking the body shapes you mentioned.

Attraction being evaluated on a case by case basis is a really good way to think about it!