What does a newborn need to wear in summer?

Trix

Dumb question but my last kid was born mid-December when it was -30 (live in Minnesota) and my new kid will be born mid July so I’m curious... what would a newborn wear middle of summer? Just onsies for a while? Or should I just plan to layer a lot? My first just wore thick pajamas for a couple months until it got warmer and she started at daycare.