First up, who is this kitten? He's World Tour, I think from Shanghai in 2003 but possibly the photo is earlier... I think it being licensed Getty Images though the date will be accurate. Possibly Pouncival?
Then kittens 2 and 3, On the right I *think* is Tumblebrutus but I'm not confident on that, and on the left, I honestly have no idea!
(Also, these costumes are very interesting to contrast against the more "standard" use of fluffies....)