Most designers were criticized by mentor Tim Gunn for utilizing fabric-substitutes such as tablecloths in their looks, which wasn't what the challenge was about.
The winner received immunity for the next challenge.
Also joining the Season 5 returning designers are Stella Zotis from "Project Runway" Season 5, Valerie Mayen from Season 8, and Layana Aguilar from Season 11.
There are three designers coming back from Season 12: Ken Laurence, Alexander Pope, and Dom Streater (that season's winner).
Jerell Scott and Kenley Collins later appeared in Project Runway: All Stars in 2012, with Jerell coming 5th, and Kenley 4th.
Stephen "Suede" Baum, in the same year, competed in the second season of the All Stars edition placing 11th out of 13.
Here’s what I came up with (with the help of Google and Pinterest searches).