If you’re looking to get Indian clothes, there are a couple of options:
(1) You can order from lashkaraa.com, azafashions.com, perniaspopupshop.com, kalkifashion.com or shopkynah.com, but remember to order at least 3 months in advance!
(2) Borrow some Indian clothes from your friends!

Bride's Mehendi
Engagement/Saagan
Pithi/Haldi/Graha Shanti
Garba & Sangeet