Lardo as Bitty's Best Lady was OF COURSE there, and she went in a jumpsuit! It's blue! It has POCKETS which is v. important for all of her Best Lady responsibilities and carrying around tissues for Shitty. She demanded dances with both grooms and the Samwell bros. She cried, a lot, and so is v. thankful for waterproof mascara.
And, true to form, she made out like crazy with Shitty for like 5 minutes because look at his face.
Diego has been to so many social events this year, he hates everything (but secretly thought this was nice, probably both grooms got a Kind Nod from him, happy wedding day). True to form, he wore a black suit but no one can say anything about it because it's a wedding so there.
Matthew was totes there because he LOVES weddings, LOVES love, LOVES Jack and Bitty. True to form, he danced (with everyone! Doesn't matter how good or bad you are! a stranger is just a friend he hasn't met yet!) and continues his reign of wearing dapper suits.