User blog comment:The mightiest Walrus/Volume 2 Trailer Analysis/@comment-3257939-20140704222905

Yang is not the only one with a new outfit. If You check the scene where Team RWBY is dressing, you can see that the whole Team got new outfites with the White Color as the main theme.

Also, knowing Weiss and Jaune plus the way Weiss looked either bored or bothered, I wouldn't call it bonding time.

More like lady killer trying to get Weiss to the dance as his date.