prom dresses with slits

I’m stuck for bridesmaid dresses ? I’ve ordered the pink multiway from Debenhams - one of them was damaged, sent back to be told they were discontinuing them. Then I ordered antique rose colour from marks and Spencer’s... model was 5ft 9 yet when I tried it on (5ft 5) it came to my ankles! I know the right thing to do is get them custom made but they are so much money. Any cheaper alternatives before I go down this route? Tia xx prom dresses with slits