basic prompt:

• her slightly-worn slightly-frayed disheveled cotton {panties|bikini-panties|panty-briefs|thong|g-string|boyshorts|leggings|tights} are creased, unevenly-rumpled and unevenly positioned on her ass and slightly lowered on one side carelessly giving it an everyday worn-in look.

have a look at some of my samples to help you get creative.