Naked fat and skinny pawns won't look right. There's a surprising amount of detail you can get in 128x128 pixels.
I reckon I could come up with something that works. Will have to sit down for an evening and produce something that does look right.
All that said, if you're playing stock RW, I don't know why it would be high priority at all. First priority is to get the pawns clothed, isn't it?
Sure it is, I don't see why more variety in appearance would actually hinder the priority of clothing your colonists.
It would almost be more interesting to have female clothes, like skirts and blouses or some such.
It'd be nice to have feminine clothes in the mix, dresses too.