It’s not a gemach, but it might help, and it might be affordable…
The Gownery
694 Central Avenue, Cedarhurst, NY
516-319-0786
sunday 12-5
Mon, Tue, Thurs 11-5
wed 4-8
(otherwise by appointment)
they rent gowns for:
mother of the bride or groom
sister of the bride or groom
maternity gowns
and jewelry and accessories
I just saw this advertisement tonight in The Jewish Home magazine (five towns). Good timing!!!
Hope it helps!