I would recommend you going for Chief Tailor in Muntazah. I have been to many shops in Doha for my suits and tuxedos but this one stands out as they addressed my order in an experienced and professional manner. Also the quality of their bespoke work was exceptional. It was truly worth and I felt special by going there, one of the best customer service among my life. Truly recommend!
For anyone their website is www.chieftailor.com