What does it take to truly make a handmade suit? If you want to do every step of the process on your own, it takes a lot and a lot and a lot of work. Think about the materials that go into a suit: the cotton, the wool, the knitting, the silk and more. You have to pick the cotton, you have to shear the sheep, you have to learn how to knit, you have to raise silkworms and more.
All of these type of videos are simply picking an arbitrary point of starting. Did he have to make the loom, grow the trees for wood for the frame/tools, grow the feed for the sheep, mine the ore and make metal tools, etc. He only sheared the sheep but chose to raise the silkworms. What makes his “from scratch” any different than a regular mfg making one “from scratch”?