I wouldn't pay anything for that.

I'd pay nothing. If I get new equipment, I want it to have new stats, but be well balanced and integrated into the game. But I'd be very unlikely to care enough about it unless there were serious oversights in the base game.

I love all the range of armors I'm seeing in the game. I want even more and I'd be happy to pay for a sizable selection.

How much would a pack of say 3 more alternative armors of each type (i.e. same stats, crafting requirements, purely aesthetic difference) and a dozen more sets of clothes, all designed by the same guys that have done such great work on the vanilla ones, be likely to cost?

And how much would you pay?