Sleep sack without metal zipper?

Ro

My son has a bad rash under his chin and on his chest where the zipper touches his skin and I think it’s the sleep sack and the zipper jammies.

I bought him two piece pjs but I can’t find a sleep sack without a zipper.

I’ve seen some of you post pictures of your baby’s wearable blankets with the buttons on the shoulder.

I can’t remember the name of them though?