We have one harness that we use all the time, she has a backup in case the one she uses gets dirty! We do have a about 3 collars for her which we rarely use, but we did use her halloween one all of October!
Stella has outgrown a few collars since she was a pup but the one she rocks all the time right now is pink and green camo. She also has a leopard print one. She is super good on a leash and doesn't pull so I haven't bought her a harness yet.