>>24095244Their original designs are sometimes complex/overdone but some Holos have very simple alt outfits.
Mio has some actually-ordinary ones including one that is literally just a blouse and another that's a sweater and a shirt, otherwise it's "add wolf ears and the orange slice thing in her hair" on top of however you draw an anime girl. If you can't draw Mio in her blouse or gamers outfit that's more of a you thing than the subject.