Modification: For the tank I just eliminated the front zipper, and for the leggings I altered the waistband to have no gathered and elastic and instead serger in a wide piece of fabric that was smaller than the waist circumference. See the tank modification post here.
Fabric: The red fabric is the same on the top and bottom and is a plain spandex 80% nylon, 20% spandex. I also cut the binding in this red fabric. The black fabric is supple purchased from King Textiles and is actually leftover from when I developed and filmed my Workout Wear Course. The printed cheetah neoprene was also used in the course. Then the grey fabric is a simple stretch jersey, and it was only used on the top because it was to lightweight for the leggings.
Notes: I wear this all the time to the gym as I love matchy-matchy outfits. I also can never wear bottoms working out that are lower than my belly button, I need a high waistline so that is why I drafted a wider band to be attached.