Q. Do indians wear baju kurung and kebaya? and vice verse

Yeaaa.. Indians in Singapore do wear baju kurung and kebaya. Especially those who are mixed. like Jawi Peranakan.
(a.k.a anak mami) Although they have their own unique culture, their dressing and certain tradition is influence by Malay culture.

As for malays...i haven't seen the pure malay wearing indian clothes.

i've seen some of my friends who wears them (indian clothes) but that's probably because they have some kinda indian blood/mix in them.

My friend's grandmother whose origin is from Indonesia wears a Sari during her younger days. She was married to an Indian man apparently.