Obi
Overcoat.
People wear orthopedic shoes and overshoes. They begin with the letter O.
Overalls!
optical lens
I think you mean "Wear" - Overcoat?
overcoatoverallsoxford shirtOld Navy shirtovershoes
overalls oxford shirt open-toed shoes overcoat
Overall.
Make OBSERVATIONS? But people do that, too.
overcoat
overalls overcoat oxford shirt open-toed shoes oxfords (oxfords = traditional shoes with laces)
Ocean is something that is blue and starts with an "o."