Laura's hoodie was, very obviously, from the Natural History Museum of Los Angeles - the people who curate the Tar Pits. Oddly, it's not in their online shop, but CritRole Closet will likely have the deets soon enough.
Ashley's collared shirt is apparently Selkie brand, but I couldn't find it. Taliesin's shirt is a frequent flyer, especially for Ashton; Travis and Sam wore shop shirts (which in my mind includes Amazon Prime and/or Hot Topic licensed).
Right now, he's just being naughty off-camera.
Actually... that seriously looks like a Liam face, don't you think?
(yes, she has tooth dice)
LIAM: Yeah, he was next rope over.
TWINNIE: :smack smack smack:
Wow, that's an ancient callback.