I have been asked to re-work the sleeves on this jacket, previously altered at another local alteration shop.
DON'T LET THIS HAPPEN TO YOU:
Whether it's a pant hem or your bridal gown alteration, consider the alteration as part of your investment into that garment. Do not compromise quality for cost of the alteration. Bad alterations are more costly because either the job is redone by a professional (focused on alterations performed correctly) and you're paying twice for one alteration; or it isn't worn because of the obviously poor work you paid for.
I have re-worked countless alterations completed at a sub-standard level by someone else, often costing more than if I had originally altered it because of "cleaning up someone else's mess". I have also turned down alterations because the client requested a compromise in quality for a better price.
Just recently, a Bride brought to me her wedding gown that had been altered by the bridal shop tailor. She questioned the fit to both the store owner and her tailor and they tried to convince her it "looked good". I would've been embarrassed to allow my bride to walk down the aisle in her poorly fitted "altered" gown. The cost to re-alter and re-fit properly compelled her to purchase a new gown. It was the right decision for her perfect day.
When finding a tailor, ask to see their alteration work. We all have a rack full of finished alterations ready for pick up. Those of us that care about quality are happy to show you what we've done.