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you can buy wristbands like this at lots of places, including Hot Topic:

exact: River Island Panda Hat in Grey – sold out
similar: River Island Cream Knitted Panda Beanie – £12.99
thanks ThisHeartBeatsx
exact: Spacecraft Force Field Green Beanie – $28
thanks Sarina
Jac Vanek Dreamer Push Play Collaboration Bracelet – $10 [exact]

Delia’s Riley Plaid Bomber – $79.50 [similar]
I assume she is wearing the same plaid hat pictured in the post beneath this, but since you can’t even see the plaid in this photo, here’s a cheaper similar hat:
Charlotte Russe Trapper Hat in Tweed or Suede – $9.99 [cheaper alternative]

similar: Urban Outfitters Sheer Dot Full Foot Tight – $14.00

Katy Perry at The Today Show on August 29, 2008 – PR Photos
Julie Mollo Bow Belt – $25 [exact]
(the romper is a custom piece also designed by Julie Mollo)
American Apparel Lamé Shiny Headband in Gold – $6.50 [exact]
American Apparel Sheer Jersey Long Sleeve Henley Dress in Black- $36 [similar] (Lights is actually wearing a henley top and a skirt)