Just take an old wingsuit with separate arm/leg wings, cut arm wings completely, and fly only with the leg wing. Either in normal tracking position, or with arm(s) stretched forward like a Superman (for BASE, temporarily stretching arms forward to set proper AoA and reduce the radius of the start arc would probably be necessary; not necessary in skydiving). You will leave any tracksuit/onesie/mutation/wingsuit in the dust.
Why no one else is doing this and why manufacturers are not making leg-wing-only half-wingsuits, is beyond me.
someone is, just give them 2 weeks and it is suppose to release
Great to hear! I started doing it in 2005 with Prodigy pants, then also with Phantom-1 and Vampire-2 cut in half (also like pants), and finally, with my V-4 with broken arm zippers, I simply cut the arm wings off and started flying like a Superman.
It just takes ridiculously long time for any innovation/fresh thought to finally catch with minds in wingsuit industry.