It seemed a good fit at first. But I washed it before using. After the wash the product shrunk. My cat is thin and her back is about 14 inches. I should have bought the large or extra large so when washed it would shrink in perfect size. I'll just cut up a T-shirt of mine and do a make shift for the time being.

My cat has to wear one of these all the time because he licks himself u til he bleeds. So I decided to get him different ones to go with holidays and such. He looks so cute!

This was a very nice suit and fit perfectly. Kitten was not used to the suit so we ended up using the soft cone vet gave us and it worked out better for us, but again, this is a very good quality suit if you choose to use a surgical suit over a cone.

Bought this for my cat when she got spayed and they're definitely better than a bulky cone. My cat isn't too fond of wearing it, and sometimes bites at it but they still hold up. At first I was nervous because it secures with velcro, but the velcro is doing great and hasn't gotten stuck on any blankets, or come loose from biting and pulling.
I thought my cat would be a small so that's what I ordered, plus one medium just incase and the medium actually works better, so when you order get multiple so you can keep them clean, and try the sizes. I ordered more in the size she wears and the blue color seems to be bigger than the pink color. Pink is fine but in the blue one she gets her arms stuck in the body and then wiggles out.
They're super easy to put on. I personally start with the head and then the legs. The head hole actually sits more around their chest so when she tries to run I can hold her in place just by holding the onesie. Sometimes when the cat is laying down it's easier to put all her limbs in the correct spot. !!ORDER THEM BEFORE THE VET APPOINTMENT!!! That way the vet can put it on your cat after the surgery and they can wear it home. If you wait to put it on at home, you'll have to deal with a very angry cat, and the process will be more difficult and stressful.
Again I recommend buying multiple to keep them fresh. My cat hasn't gotten it dirty from eating or the litter box, but as her stiches heal, there has been some leakage or leftover blood the very first day, so having multiple means your cat always has clean material over the stitches, and when you change them it gives you an opportunity to check the healing process and take any additional steps. Other times I'll just take a peek through the leg hole to make sure the stiches are okay.
Overall this is a great product, my main issue is that the sizing guide was a little off for my cat, and different colors seem to fit differently, so I definitely recommend buying multiple to see what fits your cat best. I bought this for my cat (female) and it works great but I'm not sure if it'll work for male cats. Other procedures that require tummy stitches will be fine, but not for dogs, the yail opening won't allow a dog to relieve themselves without peeing themselves.

UPDATE: In a move that would make Harry Houdini proud, my kitty slipped out of this thing in mere minutes after wearing it for 4.5 days. Over this time, the collar had managed to slip down to be more around his shoulders than his neck, which enabled him to get out with ease. Probably a good idea to check fit daily to make sure the collar does not get too low. I still think this is a good product, just watch for that issue.

My cat is around 13.5 lb and the large size is a bit snug but the fabric is stretchy and he seems comfortable. And the bite on his tummy that he was licking incessantly has begun to heal. There are NO instructions on how to put this thing on - I had to look at pictures in other reviews to figure it out. Here, then, is how I did it.

Velcro closure goes on top along the cat's backbone and the part that looks like a sweatshirt collar is indeed the collar that goes around the cat's neck.

1) Open up the velcro completely and lay out the onesie on a bed or the floor next to where your cat is resting. I did this on my bed so I wouldn't have to bend down much. Make sure that the inside of the onesie is facing you, with the holes for the back legs closest to you.

2) Gently cradle your kitty in one arm and hold him so that he's basically standing on his back legs right next to the open onesie.

3) Use your other hand to gently lift the cat's left rear leg just barely off the mattress and place it through the corresponding hole in the onesie. Go slowly, be patient, and speak gently and lovingly to your kitty as you do this - it's a weird experience for him and you want to keep him calm, happy, and not nervous! I was basically hugging him close to my body with my hear right next to his as I calmly talked him through this.

4) Repeat for the right-rear paw.

5) Slowly and gently slide the onesie up enough to put the left front paw through its corresponding hole.

6) Bring the collar hole over the cat's head, always moving slowly and talking gently, and telling your kitty how good he's being and how this will help him get better!

7) Put the right front paw through its corresponding hole.

8) Adjust the onesie enough to close the velcro - it doesn't have to be perfect. Just get it closed and allow your cat to get used to the feeling of wearing this item. Opening velcro is REALLY noisy and some cats may find it unnerving, so don't fiddle with the velcro just yet.

9) If you've gotten it on him, success! Don't worry about adjusting the fit - the cat will take care of this for you as he moves around a bit. After the kitty has worn the onsie for a couple hours and has gotten used to it, you can readjust the velcro if you want to do so.

I was REALLY surprised that my kitty let me do this - he is pretty nervous about having one of his back paws handled after I had clipped one nail too short YEARS ago. But he allowed me to do it, and he actually seems to like wearing it - like the thundershirt vests, I think he gets the feeling of an all-over hug from it. (Though both of my cats really did not like the thundershirt - I think it was too constricting and they never seemed to get used to it.)

One thing to be aware of: this will compress the cat's fur a bit, so he may not be as warm as usual when wearing it. If it's wintertime, make sure that your cat has a heated bed or other way to keep warm while wearing this item.

I bought two of these so I could wash one while he wears the other. So far, it seems to be working well. He can eat, drink, use the litterbox, and groom without disturbing his wound. I think that for really large cats the L size might be a bit small.

Very pleased with this item.