Size for snowsuits!!

Jullz ☀️

My 3 year old is still in 2T clothing and I don’t see a change in size anytime soon for her… I’m thinking about snowsuits and wondering if I should size up and if so, how much? I obviously keep in mind that she could have a growth spurt in the next few months but should I wait until it’s closer to winter? 3T or 4T? 🤨