Thoughts on Pellegrini's world record swim!

I love watching great swimmers in slow motion and Pellegrini is a great swimmer.

1) She wore two suits
2) A long stroke, nice catch
3) She looks up when she swims
4) Straight-up-and-down flipturn - left leg is lower than her right on the push-off
5) Dolphin kicks
6) Takes her first freestyle pull with her left arm underwater and makes a 360 degree rotation with it as her first pull above the water and breathes on the second pull
7) Loving that Tattoo (Enough about my problems)
8) Looks at her opponent at the finish instead of streamlined.

I am seeing athletes wear two caps and this is the second one I saw wearing two suits. Does wearing pairs of suits and caps create buoyancy?