Hires fix and ADtailer would give good results.

Recommended weight: around 0.7-0.8
Triger Word: sntm
Sample prompts: sntm, 1girl,very long hair, bangs, sidelocks, hair ribbon, braid, medium breasts,
Alternate hairstyle:
(Single bun): sntm, 1girl, alternate hairstyle, Single bun, bun cover, nape, bangs, sidelocks, medium breasts,
(Double bun): sntm, 1girl, alternate hairstyle, double bun, braided bun, nape, bangs, sidelocks, medium breasts,

Hint: Since maid costume (black) and waitress costume (pink) are easily mixed to each other, in the case, it might help their separation to put the other word to negative prompt, like "(maid:2)" or "(waitress:2)".