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Someone correct me if I'm wrong, but do I just take the xxx and make it whatever number of the new slots added that I want to find the modded clothes in? I downloaded a mod that is already set up and the file is "decl_015_u.ydd" and then the ones with that are "decl_diff_015_x_uni.ytd" (x being A-G)

but I don't see the clothes at that number, instead, this particular piece is at number 242 out of 376.