M not pretty sure about the tradition of wearing mangalsutra in the northern parts of India...
As far as South India is considered... married woman wear the sacred thread from the day one of their marriage until their husband's death.. It is different regions of the southern states but they wear it compulsorily. Sindoor is not that much compulsory in south side...
In many other Hindi Serial hav seen women wearing it especially if you guys had watched any K serials then you would hav known... they wear it.
Edited by ash_huti - 14 years ago