Baby bonnet / hair care

Has anyone used a baby bonnet for their baby?? My baby had cradle cap and I managed to get it all out but I wanted to take steps to make sure she doesn’t get it again. If you did, is there a kind you recommend and did you have a special routine.. my baby is biracial. I’m asking because I went to the store just to see if they had some and the woman looked at me crazy when I asked if they had baby bonnets.. she said she didn’t even think they made them.. my baby is a little past 3 months old.. thanks in advance.