Those scarves are for sale in Poundworld so not doubt they'll sell alot of them in store with them being so cheap - i only had a quick look at them but i think they were just look a humans scarf, didn't see a fastener. They#d got the same for dogs
That cat collar is a scrunchie, they're like the hair scrunchies we use and i find they can be quite tight when i've worn one on my wrist