Jason almost had it in him to be mad, You were wearing HIS Robin costume. He couldn't find it in himself to be mad though, he just stared in shock as you were pestered and teased by Cass, Steph, and even Tim had joined in. Clearly you'd lost a bet, to who he couldn't say. But clearly you'd agreed to the bet thinking there was no way you would lose and now you were paying the piper. He whistled lowly as he walked further into the cave, "Didn't realize we were having a little nostalgia party, gotta say it doesn't suit you as much as it did me."