This is Boots & Barkley "sweatshirt" in size XS, cream & white stripes.  Sweet little Ollie is modeling for you (and yes, he has two ears, he was just holding one down).  Other than him modeling this, it is brand new but I have removed the inside card for shipping purposes.  The size guide is shown in the pictures:  "up to 10 lbs", length 10 inches, neck 8-11 inches, chest 11-16 inches, head 8-12 inches.  Also will fit cats.  It is fairly light-weight, but does have the inner "fleece" like a sweatshirt.