It depends. If it is a bespoke tailor the costs are likely to be a markup of something like 15..20% for the tailoring, and then for the fabric as well. If you get super 130 italian wool or something of the sort - well, that markup, especially in the fabric costs, will begin to bite much harder.
Vaish is a well known bespoke tailor in bombay .. and check this thread for more.
http://www.tripadvisor.in/ShowTopic-...harashtra.html