If you can get your hands on a Madrich Chareidi (phone directory for the Chareidi communities in Yerushalayim – there may also be ones for other cities), there is a whole section on gemachim there. You can look up for gemachim on clothes.
But just as a suggestion, there is Beged Yad LeYad. It is on Panim Meirot. I do not know if the mods will let me to post the phone number or specific address.