Lately, I've been working on obtaining the rest of the costumes I've not yet gotten and I am one away from 100% (Now at 99.80%). This costume in question are the Akahara Reisou ("赤原礼装" in Japanese) password parts. According to my collection log, I've gotten the male costume but not the male Cast parts.
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However, after inputting the password, I get the following message. I assume this says something similar to, "You have already used this password".
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To my understanding, if a costume/parts password is used, it would be added to the collection log. I've even tried the same password on a new save file and got the parts.
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I might've overlooked something rather basic, but I can't figure this out.