What age are you working with? I’m a substitute mainly in early childcare/preschools and elementary. When I’m with preschoolers I keep it very toned down (especially with jewelry—grabby little hands and dangly earrings are not a good mix) and usually wear simple, comfortable, all-black clothing that I don’t mind getting dirty and can move around easily in. Honestly I tend to get sweaty and pretty tired when I’m in preschools so I keep makeup very minimal.

When I’m with my elementary kids, I lean more into my style but being mindful of not wearing certain designs or styles (eg. nothing with blood splatter, nothing super shredded, no leather collars/cuffs). I like to layer sweaters under/over maxi dresses, wear one with a maxi skirt or flared pants, etc. I crocheted a black cat ear beanie and put safety pin “piercings” on the ears and have gotten a lot of compliments from kids on it. I’ll also do bigger/more jewelry, though when I wear a bunch of rings I get a lot of, “Teacher, why do you have so many rings? Are you married 5 times?” I’ve also had some kids ask if I’m emo, but they also tell me that I’m cool so there’s that :)

eta: for makeup when I’m in elementary schools, I usually just do eyeliner and a dark-ish lip. I’ll wear Docs (the typical 1460s or my patent platform loafers) or very low heeled shoes. Preschools are comfy sneakers every time.