In reply to Pesda potato:
Not gloves, but when I asked on here for something to give more grip on webbing belts that were slipping, one recommendation was Seam Grip. I used that and it certainly increased the grippyness on webbing belts though not excessively. On the belts it was not visible when dried, nor has it affected the fabric as far as I see.
Possibly a long shot, but you could try that on gloves?