Buying outfits in the store seems a bit bugged, I bought the Raven outfit for Mary having 2000 saved up and it took me down to -15k a weird bug it seems.
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So, for some odd reason, when I had clicked the outfit just once, it thought I wanted to buy 34 of the same outfit. I’m not entirely sure why it happened, but it also did the same thing although to a lesser degree with the Christmas outfit for Yui. There were a total of 3 Christmas outfits in my inventory for Yui and 34 Raven outfits for Mary.