You can select them when your tama is an adult and it will wear them for about 20 seconds each time- but they are re-useable, so you can use them again and again.
As far as I can remember all items of clothing are re-useable,on V3 they are;
Cap
Bow Tie
Bow
Shirt
Shoes
Rollerskates
Wings
Wig
Sunglasses
(except the Nyatchi stuffed toy costume- that is one use)