Look here:
http://www.turkishairlines.com/en-in...baggage-delays
You can send your bills for your expenses caused by the delayed baggage to TK, and they will compensate you for it.
Go buy some clothes if it still hasn't arrived
You should contact them here:
http://www4.thy.com/baggage/start.tk?lang=en
This happened to me once. It takes time for them to pay, but they eventually do it.