Hey all! I have been following this thread for a while and there are a few things I have noticed and would like to share with everyone.
First; Cable's pistols are Walther PPQ Q5 Match (the ported slide is a dead giveaway). As the Q5 isn't available in airsoft (as far as I can tell), the regular PPQ airsoft pistol would be the closest one could get.
Next up is Cable's shirt; in the 'Meet Cable' trailer, in promo pics like the one with Brolin posing with 'Tiny Deadpool' and in the prison scenes it looks to be an Under Armour Men's HeatGear Printed Short Sleeve Compression Shirt in graphite/black, (can be found on Under Armour's website or on ebay).
Another part I stumbled upon is that Cable's gloves seem to be Campstoor tactical hard knuckle gloves (can be found on amazon for about $12).
Also, one idea I have for his boots: if anybody is like me and finds it hard to modify/are afraid of messing the boots up during modification (that can be a spendy mistake lol), a good alternative would be to use leather military boot gaiters. They offer a similar look while not being a permanent part of the boot (and the gaiters can be modified more cheaply than the boots themselves).
If anybody has any questions, feel free to send a message!