"(character name) with visible seamline around her neck between chin and throat" works slightly better (1 in 3 times) if you want something like a body-only skinsuit. Still it somehow just won't let you have seamlines on the waist or arms too.

And that's Novelai. GPT actually understands your demand quite well but it very often just refuses to do so cuz identity theft goes against its ethics or something. Any tried creating skinsuit stuffs with Stablediffusion? Is it better?