Jac Vanek Dreamer Push Play Collaboration Bracelet – $10 [exact]

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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)

Katy Perry at Warped Tour on June 20, 2008 – PR Photos
Fred Flare – Sweetheart Sunnies – $11.00
Girl Props – Translucent Frame Heart Glasses – $9.99
Goggles and Glasses – Funky Heart Shaped Kiss Lolita Sunglasses – $7.99 [best match]
House of Sunglasses – Clear Heart Sunglasses- $9.99 [best match]
Monikapolitan – Neon Mirrored Heart-Shaped Sunglasses – $8.00
Quixotic US – Lolita Cute Heart Sunglasses – $12.00 [best match]
Scarlet Ribbons – 80s Neon Pink Lolita Heart Sunglasses – £8.00
Totally Rad Sunglasses – Neon Heart Mirrored Vintage Sunglasses – $7.99
Jac Vanek Lurker Bracelet – $10 [exact]

fueledbycooper found these leggings in the German H&M webstore. H&M does not have a US webstore, but they are available in stores for $12.95.
some similar pairs:
Miley Cyrus & Max Azria – Juniors Studded Leggings – $10.00
New Look Stud Side Leggings – £10.00 (thanks ThisHeartBeatsx)