One tailor I used in Patong once does trips to Norway twice a year. He'll be in Oslo 2 days/nights, taking customers at pretty much all hours. He e-mails all his clients and former clients in Norway beforehand and asks everyone to come to his hotel and also recommend him to all friends and family. He gets a lot of customers, he'll dotrips to other cities as well.

3-6 weeks later the orders arrives by mail, of course marked as "gift" thus bypassing Norwegian customs and the 25% VAT.

No fittings this way though, there will only be fabric samples and pictures to look at.