Sutta Punav one of the very important and auspicious day for Konkani Community is on August 29 2015. On this day all the men at home who have had Brahmopadesham (thread ceremony) will have to change their thread and wear a new one. This can be done at temple or even at home in front of family deity. It is a renewal of sacred thread and the thread is called Jannuve in Konkani.
I have read its a misconception that only Brahmins wear thread. Even Kshatriyas and Vysyas wear it. I came across a very interesting article which mentioned "Ancient scriptures say: “The sacrificial thread of a Brahmin must be made of cotton, so as to be put on over his head in three strings; that of a Kshatriya of sana thread only; that of a Vaisya of woollen thread.”
Usually unmarried men wear one with three threads in it and married men wear two with three threads in each. I recently learnt one is for wife. I was surprised to read in ancient days even women wore it and did sandhya rites. I am not sure why women had to stop this practice. This needs to be worn on left shoulder which hangs towards right.