A diaper, also called a nappy, is a folded piece of cloth worn on the bottom of someone who can't use a toilet. Babies wear diapers before they are potty trained. Cloth nappies are usually held shut by a safety pin.
A disguise is something you wear to make yourself look like someone or something else.
The man in the photo is in his 20s and is disguised as a much older man, with makeup, glasses and a false moustache.
A dress is a piece of clothing that covers both the top and bottom parts of your body. They are like a top and a skirt joined together, and are usually made out of the one fabric for both the top and bottom part. Dresses are usually worn by girls and women.
Gis forGag (restraint)
Garb is a word that describes either a style of clothing, or the clothes you are currently wearing. The girl in the picture is wearing renaissance garb.