I took a chance and bought some preloved 501s (so can't be returned), and they fit me amazingly well.
They are a few years old but it's obvious they haven't been worn much at all. One thing I didn't notice on the photo is that they have quite noticeable 'whiskers', I don't know the correct term for it. Not an acid wash but white lines across the front in hip area and on the leg, what I can only describe as a star type bit which is lighter (bleach washed). The jeans themselves are the darker blue denim so the stripey part and leg part are quite noticeable. I know these were quite in fashion a few years ago, these are from 2017 if it helps at all.
I've never dyed blue jeans, only black and also never a pair that have this type of acid wash.
If I take them in to be done it will no doubt cost more than I paid for the jeans, so I'm tempted to just give it a go myself.
Just wanted to see if anyone had done this successfully before. And did the stripey bleach bit blend in with the darker rest of the jeans?