What to pack/wear for NYC in spring?

I'm going on a trip to New York over spring break with my theatre group and wondering what to wear/what level of awful weather to prepare for? We will mostly be seeing plays and attending acting workshops/talks, but will also be doing lots of sight-seeing. Is it usually rainy and snowy and freezing cold? How nicely do New Yorkers dress/is it fashion over function or the other way around? Any tips or advice would be much appreciated! 😊