Because the matches prioritized grappling, pins, and submission holds, the attire had to be functional. The "fight top" (usually a sturdy sports bra) allowed for a full range of motion. It bridged the gap between the swimwear often seen in "apartment wrestling" photography and the utilitarian gear of Olympic wrestling.
When compared to other leading brands, here is how the general class of this gear stacks up: Vs. Premium Brands (Venum, Hayabusa) dww bsa fight top