Chef’s Costume by Flexa. The beautiful Chef’s Costume by FLEXA is made from 100% cotton and each piece is incredibly soft. The apron and chef’s hat is made from quality materials and is comfortable for children to wear. The apron fits children aged 3 to 6 years old. It has a practical pocket so the aspiring chef can store her utensils so they are at hand when needed. The apron and chefs can be hand washed if they get dirty during playtime.