Overalls, overcoat, one piece swimwear and over the knee boots are clothing items that begin with the letter O. Additional items include obi, Old Navy shirt, oxford shirt, open toe shoes, orthopedic shoes and overshoes.
Overalls!
Obi
optical lens
Overcoat.
I think you mean "Wear" - Overcoat?
People wear orthopedic shoes and overshoes. They begin with the letter O.
overcoatoverallsoxford shirtOld Navy shirtovershoes
overalls oxford shirt open-toed shoes overcoat
Something that you wear that starts with the letter I is: "I'm with Stupid" T-shirt Irish Skirt
You can wear an apron.
overcoat
anorak