Really great dog costume for Halloween. size 12 month, but could honestly fit up to a regular sized 3yr old. It has some filling for added warmth & plumpness. Fully lined. Full Zip. velcro dog collar closure. Very well made. The tail kinda wags back & forth when they're walking because they added some filling to keep its shape & weight. The last pic is my kid still wearing it at about 5- can't zip it anymore tho. Sad to see it go.