4. Sink or Swim

2016 - Season 15

In the Heidi Klum Swimwear challenge, the designers create their own fabric to use in designing a stylish swimsuit.

3. Blacklight or Daylight?

2016 - Season 15

In Project Runway's first Blacklight challenge, the designers have to create a look that sparkles not only in daylight, but under blacklights on the runway as well.

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