Was just watching it last night and I don't know how I managed this but in all the times I've seen it before I never noticed the wardrobe. It looks like it was all done by Martin Margiela or something... nearly everything Ogata Issei wears is brown and grey, including old work-style dress shirts, shawl-collar cardigans, trousers, etc. etc. It was very cool (and it's a fantastic movie). I suggest watching it for dressing inspiration. The two women featured in it are absolutely gorgeous.