You are able to select the kit you want to play in duels by clicking on a mannequin with the button on the right side of your mouse, but you can only do this if you have a rank (if that's what you're talking about).
As previously mentioned, you need at least Iron rank in order to pick kits in duels. However, you can pick any kit you want when dueling a specific player by right clicking on them while in the PvP lobbies. I hope this answer was helpful. Should you wish to purchase Iron rank, you can do so here.
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