I always use the one on the Aquapark Road with all the tailor's dummies outside. She speaks good English and I know a lot of ex-pats use her to make clothes. I usually get her to shorten dresses for me. She charges 5 lira per item. She also added a lining to one long dress I had and that was 15 lira.
She only does items for Woman.
My husband did use the shop by the Guitar Bar to shorten some trousers, they made a good job, but the day we went in, no one spoke English, but it was not a problem we managed to get over what we wanted.