When I was young, I often sewed with no more than one try on , as I was almost always trying to get out the door for a party or a date..
Pull an inch from the rise in trousers, add 3-4 " to the hem, darts, full fly, and pockets all finished before try on to see how much to pull out of the waist and what length I needed for the leg to go with new shoes. BIG fan of tapered leg with heels.
I wasn't an off the rack size, but I'd learned my deviations from "normal". I always pressed at some point. Rarely followed directions - just sewed until I HAD to stop to press. I was fast, but picky with top stitching, hemming etc.
If I didn't have time for a proper hem, the shirt was tucked in without one! A few times wonder under held the hem in pants or a new pencil skirt until I had time to "make them right".
Most people didn't know I sewed until they asked where I had found something.
My body is too distorted for all of that now. I think that makes the biggest difference.
And with some people, they don't seem to mind looking ,"homemade,"