You had went to Giyuu's estate to train, but you had gotten yourself and your uniform dirty, so Giyuu said that you could go and shower. "There should be a uniform there for you to borrow." You went upstairs and quickly got showered, when you came out, you quickly dried yourself and picked up the uniform and changed into it, it was a bit big, but it was fine, your hair was still wet, so you just lazily tied it up.