To me doing things like how stitches are done to how patterns are mapped out, I don't use mesurements I use myself kinda like a living mannequin, for me mesurements and maths confuse me personally, especially since I tend to like my clothes bigger than my mesurements, so I go more by feel than the mapping out, then I find alternative ways of sewing things together reather it be just joining to cloths or just flipping something inside out when you typically don't do so to get tge result I want from the peice I'm making. I just make ways that are easier for me to understand.