Sei K.
Google
From escalator, walk straight and you'll see Joyce & Rita . Stall 129 for suits . Stall 159 opposite for dresses, gowns, qipaos .
Do go early in your trip to allow time for adjustments if needed (They will adjust till you're satisfied. I didn't have to adjust as it was perfect the first time!) and more time to make more pieces after you appreciate the high level of service and quality from them.
Bespoke, custom-made, tailor-made to your measurements. Choose everything to the finest details (type of collar, buttons, etc). They have wide range of fabrics so you'll definitely find something that suits your budget and needs.
Can also get advice from them as to what suits your body shape, what is the current fashion trends, etc..
Overall a very satisfying experience. My go-to place whenever I'm in Shanghai. Highly recommended!