I agree people shud have freedom to choose what to wear. You can wear whatever you want. If you feel comfortable you can wear minis in temple or any other social functions its up to you. In my opinion every individual is free to do whatever they want unless they harm other. This is where the social values and upbringing plays a part. Family values have great impact on how you treat or respect other even by what you wear in social functions.

Most of the people living in USA are single or just couples and they don't wanna care what other people might say about them. In fact, they want to show off more than what they have. (ex... fat ass aunties wearing tight pant ) That is where they slip. I don't know but most of the Nepali girl looks ugly in such dress, american looks so good. May be Nepali girl grab whatever in sale, instead of some disigner dresses. 

I personally think that girls can look sexy even if they wear KURTAS if the dress suits thier personality, fits in thier body and wear it nicely. About preserving Nepali culture, Nepal shud be in your heart not in your dress.