No. Crookened is the opposite of straightened.
The manipulation of the neck point of a coat (anything with sleeves is a coat) or the seat angle on a pair of trousers is called crookening or straightening depending on which way they are moved.
There is much antiquated jargon in the tailoring trade and it is still used… Just yesterday, my new assistant asked me if I had any mungo he could knock up a vest baste in. I told him all the cabbage was under the board and he may find some there.
He is a good lad but slow. I could probably improve productivity further if I could find a kipper and a good jumper.