Maybe it's somewhere and I'm just a newb, but here's a suggestion.
When clicking info for any equipment, make sure to add requirement lvl for each equipment (I'm not talking about equipment points to be able to put it on), I'm talking about a weapon going red in your inventory cause it's above your actual level... Why? Because when you buy the weapon, doesn't tell you if once its in your inventory you'll be able to use it.
So: a) either write in the minimum lvl requirement to use equipment/weapon in the info tag of the equipment/weapon
b) give it a color in shop so that one does not buy equipment he can not yet use (can't be red, cause red is when you don't have enough cash in shop to buy the equipment.)