This depends on the level of tailoring. There is a vast amount on the internet about this, but as you asked 'you'... I do buy tailored suits. They're made-to

This depends on the level of tailoring. There is a vast amount on the internet about this, but as you asked 'you'... I do buy tailored suits. They're made-to-measure. That's good enough. Somewhat between true bespoke, the baste is adjusted to fit in-person during second fitting. Good fit for baste is key to a good fit for a blazer. The feel/effect is essentially that I'm wearing the most comfortable T-shirt I have, but it is not a t-shirt, but a suit jacket. Trousers don't really need a second fitting. For fabric, I really like to first feel and see. Super 100s are usually fine; there's a lot of inflation in higher thread counts. Mass-produced can do production of good quality clothes without issue, they've done so for decades; for example Armani charge a huge amount for what's a nice fabric but adjusting on final fitting really reduces the point of paying more. Good cloth is worth it, but doesn't need to break the bank. Brands usually don't make the cloth themselves, it is a commodity, if fiddly to get exactly what you want. One big advantage mass-produced has on custom is quality of stitching. Mass-produced means the stitching quality can be really tight/close and of excellent consistency (take a look at your shirt, how consistent is the stitching? how loose is it? Distance between stitches, quality of thread?). For mass-produced, stitching is certainly not done manually. It is fully automated. Tailored for wool often works better if the workmanship is top-notch (heavier fabrics) but for cotton mass or semi-mass produced shirts mass-produced often brings a much better stitched that can be adjusted to fit, compared to purely tailored/manually machined/bespoke. Clarification: I live somewhere where there's a great tradition in tailoring, and prices are not high.