Thanks!Nick Lopez in the Galleria is expensive but reliable (primarily a very very good bespoke shop that makes for much of the local royalty, but also have an alterations shop). Martin Tailors in... approximately Rice Military?... is my primary shop but fwiw I've seen people on here warn folks away from them. They've done solid work for me across a wide variety of tasks though.
I've contacted them before and they said they will charge 100-175 for basic alterations... although idk clean up the back is considered basic.