Terminology is confusing, but usually made to measure is when a garment (jacket, coat, shirt, trousers) is made to your specifications on demand. Services vary, but usually the size will be adjusted to your measurements, and you can choose fabrics and construction details.
Many local tailors will do this, and the price isn't much higher than an off the rack piece. If you are buying from a high street brand off the rack you are most certainly getting ripped. Many brands use poor fabrics, choice is limited, and fit isn't great. A made to measure piece will be cheaper, can use better fabrics, will definitely fit better, and gives you plenty of choice and customization. It's almost like a cheat code for nice clothes!!
For example a commissioned a wool jacket in a Loro Piana fabric from a local tailor. I was able to add details such as contrast colour stitching in button holes, custom lining and my monogram on the interior. The cost was about 20% (that is, 80% off) from a comparable jacket from Loro Piana, and using the exact same fabric, which a much better fit to boot.
Likewise you can pay tailors to alter garments. Alterations isn't magic but sometimes you can buy second hand or vintage and get a piece that suits you much better.
A caveat here is that in this case you get what you pay for and construction might not always be great. I had tailors that did great jobs, others that did lousy jobs, and others that do not so great jobs, but the price is so cheap that I put with them.