In the end Sirius had turned a set of robes into comfortable trousers and a smart jumper. He still wanted to really dress Teddy up, but it seemed fitting to put him into something that was more Remusy. He didn't change the hufflepants, that would be sacrilegious.
Once dress up was done he took Teddy back to the tower. He could tell the kid was nervous, so he held his hand tightly on the whole walk over. He gave the fat lady the password, then gave Teddy a bracing smile.
"You got this."
He stepped through, gesturing for Teddy to follow.
"Moony? Are you in here? I've got someone you're really, really going to want to meet."