What would you do with the energy? Money making? Skills leveling? With x2 Time Warp you get double the amount of training/money in the same time. Do the math. You can think about extra Energy if Time Warp costs too much (gets more expensive, the more you have).
Winter jackets? Sounds interessting. Only seen skimpy outfits so far. My wardrobe options dont offer me anything resembling a jacket to buy. You do not talk about the training outfits you sometimes see after a fight? That bathrobe/fighting suit stuff?