Haha, well for anyone who wants to mod the PC textures I've found this out:
You can extract the UPK files using tools people created for X-Com, only trouble is the textures are in .TFC format and they aren't able to be read, I found a tool that reads them and converts to and from PNG but it's 50/50 on whether they work or not when replaced. The models for characters also seem to be in there but as I'm not clever enough when it comes to modelling I'm not sure if the models are rigged or if it's separate so someone else can check that out.
The Red Glove replacement was done by replacing the actual texture in the UPK folder but that's all I've gotten to work so far with that method, if you'd like to edit the textures easily then use a program called TexMod, but be warned you have to start the game through TexMod each time.
I've also found out the clothing is done in layers, for example Dante isn't just a model + skin texture he is divided up into Boots, Coat, Hood, Top/Gloves, Trousers, Hair, Face, Eyes, Devil Trigger Face, them the UK flag, red near his hands and pendant seem to be separate as well. So until someone figures out how to make the .TFC files work 100% TexMod seems to be the only valid way of editing the textures for now. So I hope this helps anyone out.