matha patti's are kinda out now...jhoomars are always always in.
naths are coming back in as well...so if you want to wear it, go ahead.
also the trend is to go completely traditional on barat day, ie have the hair tied back, traditional colors, the heavy jewellery etc, and to go contemporary on walima, in which you can have your hair open, colors are usually lighter.
Hmm.. good advice.. thanks!