Ho Chi Minh City's tailors can whip up a haute couture number or something for everyday wear in as little as two days. Tailors offer their own designs and have magazines and pattern books with the latest styles. You can create your own masterpiece, too. Bring your own fabric or pick something out from the tailor's collection. In Saigon, the average cost for a men's suit is around USD200. Tailors are experts at reproduction, so take in your favourite piece to get copied. Most HCMC tailors speak at least a little English.
Agree on cost beforehand. You may net a slight discount through negotiation, although tailors at Ben Thanh Market seem to have fairly fixed prices. Mens' dress shirts average around VND500,000. You can specify details like buttons, thread colour, pockets, etc. Quality of work is correlated to wait times. It is unreasonable to expect anyone to create a masterpiece in 24 hours! Double-check the material for quality, and in the case of silk, authenticity, before purchasing. Insist on more than two fittings to ensure the right fit. Check stitching for quality. In addition to shirts, suits and dresses, Saigon's tailors will craft winter coats, wedding dresses and even traditional Vietnamese ao dai.