You can get nearly anything custom tailored for cheap. If you ever go to Hong Kong, walk down Nathan Road. You'll be pitched to by about a hundred or more Bangladeshi immigrants to come and have a fitted suit and some shirts made. They'll measure you, you give them a day, then come in for a second fitting, pick your new duds up the third day. The price will be comparable to Marshall's or TJ Maxx or deeply discounted (like clearance priced) US retail, if you don't negotiate hard. If you're a good negotiator, you can do much better. Nathan Rd. in Hong Kong is the most well known; there is a shop named Sam's that is world famous, but the prices are much higher. Beijing also has a similar area or two where the quality is the same and the prices are even cheaper, one of them is near the pearl market. I've never been to Shanghai, but I'd bet anything they have the same kind of thing. The ones in Beijing are like any other Beijing market, hundreds of independent vendors in one complex. The tailors in HK are usually in little store-fronts adjacent to Nathan Rd. If you know your measurements, you can send them to one of these shops and they will mail you the clothes, assuming you can find a trustworthy one and not a scammer.
I had a wool suit made and it fits me well enough. I've never had a problem finding suits that would fit me off the rack though, so it's mostly a novelty. I also wasn't completely satisfied with the way the trousers fit, but I didn't have time to have them re-made. They are very well-constructed and durable though, and have lasted several years now. The best thing was the shirts, I bought a dozen at about $13 USD each, IIRC. I have long arms and I can rarely find shirts off the racks that have correct-length sleeves and aren't too big everywhere else. These shirts fit well, and are comfortable to wear, and look good. I've worn them a fair amount and they've lasted a few years. The only problem is that the buttons were ruined by the dry cleaners on a couple of the shirts. The buttons were apparently cheap, I chose them myself; but I apparently can't look at a button and judge whether it can withstand dry cleaning/pressing. This happens to some of my store-bought shirts too. I might order another dozen of these shirts, because they were cheaper and much better than anything I've ever bought retail. That is if I get brave enough to do an internet transaction since I have no plans to go to HK any time soon.