John Bickle is the man to talk to.Bickle Racing Altering waist size is usually more expensive than the pants are worth.They have to be completely taken apart to rebuild.Especially if there is a 360 zipper.
I have a pair of AStar bat pants size 32 that no longer fit? (they shrank!)
I do leather work and have the equipment but riding gear it's not my specialty (I do fur and really heavyweight workwear). Down sizing garments is really easy, any tailoring shop can grade down. Reducing the waist and tucking the legs a bit should cost you less than $50 -- it's only 20 minutes for an experienced leather shop. If you're reworking length, that's gonna cost you more -- a lot more.