Seamstresses to make alterations during con?

Not sure if there is an official thread, but here goes. I was wondring if there would be any seamstresses or comissionists that could do some simple alterations for some tips? Any help is appreciated!

I brought my machine along in case something needed to be fixed. What are you having problems with?

I just need some fabric taken in. I had to buy a generic TNG uniform from Amazon after my commissioner couldn't make the deadline due to personal reasons. I would happily pay for services rendered. Its my first time at Dragon Con.