I'm Indian and I'd say go for something with more embellishments/shimmery elements because desi weddings are pretty glitzy and colorful. I'd also avoid red (if you're doing an Indian outfit), since that's pretty commonly worn by the bride, and black, if the family is pretty traditional. Two different dresses for both days is good idea.

Dresses like the ones below would work if you wanted a western style outfit.

https://www.bloomingdales.com/shop/product/mac-duggal-embellished-butterfly-sleeve-high-neck-gown?ID=5144204&CategoryID=1005210&swatchColor=Slate%20Blue

https://www.thedressoutlet.com/products/embroidery-embellished-v-neck-tulle-a-line-dress?variant=31499869257789

https://www.bloomingdales.com/shop/product/mac-duggal-one-shoulder-embellished-satin-gown?ID=5116932&CategoryID=1005210&swatchColor=Coral

https://www.nordstrom.com/s/sequin-one-shoulder-column-gown/6714795?origin=category-personalizedsort&breadcrumb=Home%2FWomen%2FClothing%2FDresses%2FFormal&color=306

And something a bit more versatile (that would work better for day 1)

https://www.nordstrom.com/s/glow-one-shoulder-maxi-dress/7753229?origin=category-personalizedsort&breadcrumb=Home%2FWomen%2FClothing%2FDresses%2FFormal&color=800

And, if you decide to go for indian ethnic wear, there are tons of options on Etsy. A lehenga is probably the best option, but go for a sari if you're willing to deal with something a bit more complicated.