More fun with light painting 11-28-15

Tonight I did some more playing around with light painting:

For this image, I used:

1. A long exposure.
2. A flashlight.
3. One White Lightning WL 5,000 studio flash with a blue gel.
4. Two Pocket Wizard remotes.
5. A black t-shirt.

 Care to guess what the t-shirt was used for?