I'm going to start with underwear and build out from there.
Ideas for 'chest' support/covering:
1) A stretchy 'bra' that loops around the arms, pulling itself tight enough to stay in place.
2) An ordinary 'bra' that loops around the arms and kept on by a string from the back of the shoulders across the front of the neck, maybe in a knot or tied to a metal ring with an optional third string up from the center chest.
3) A 'bra' that loops around the head, neck, and shoulders like above, held together by buttons/zipper/ties down the center chest.
Ideas for crotch support/covering:
1) Stretchy fabric like any modern underwear, with gaps for the wist, thorax, and each leg. (They'd have to exhale and hold their breath while squeezing it on, but I think that'd work.)
2) A fabric ribbon like a scarf wrapped loosely around the crotch area until sufficiently covered, then tied off or tucked in.
3) A loincloth, tied above the thorax (might be uncomfortable if too tight, but necklaces aren't rare).
The upper torso I'm not sure there's any way to fully clothe. Sleeves can be supported with string across the front, and the strategies above can be doubled up, with more fabric.
Lower torso:
1) A piece for the upper and rear thorax, which attaches by zipper/stiches/buttons/ties, etc. to one for the lower thorax and legs, and a belt.
2) Pants that wrap around the thorax to button, strap, or tie along the sides or top, pulled up by a string or belt around the thorax connection in turn connected to a loop supporting the front of the pants
Gloves, shoes, and headwear are as for a human, but nothing wide-brimmed that extends backward would stick perminantly.
The jumpsuit: a single piece of fabric (or whatever) with sleeves on as per chest strat 1, 2, or 3, goes into a narrow strip down the center of the stomach, [edit: or a kind of hourglass or X-shape narrowest in the center torso] (keeps it out of the way of the wings when the spine turns) to the top of the pants, lower body as per strat 1 or 2.
All of the above work for either gender, assuming you went with the popular default, though I imagine only one matters for the character(s) you're thinking of, hence 'chest.'
Any of that helpful? 316