No universal size standard exists for cat clothes. A 9-pound cat may fit a Medium shirt while a 16-pound dog needs a Large. I learned this after ordering a Small for my 10-pound cat and watching it arrive tight across his chest.
The 3 measurements that matter
A 9-pound Siamese has a very different build than a 9-pound British Shorthair. Weight alone won't tell you which size fits. Measure these three points and compare them to the brand's chart:
How to measure your cat:
- Neck Girth: Measure around the base of the neck where a collar would sit
- Chest Girth: Measure around the widest part of the chest, behind the front legs
- Back Length: Measure from the collar area to the base of the tail
Use a fabric tape measure or a string and ruler. Measure while your cat is standing. A helper with treats makes this easier.
Cat clothing size chart by weight
Many sellers use these weight ranges as a starting point. Verify with the specific product's measurements before ordering.
| Size | Weight Range | Typical Cats |
|---|---|---|
| XS | Under 6 lbs | Kitten, small adult cats (Siamese, Cornish Rex) |
| Small | 6–10 lbs | Average adult cats (Domestic Shorthair, Abyssinian) |
| Medium | 10–14 lbs | Larger cats (Maine Coon, Ragdoll, Norwegian Forest Cat) |
| Large | 14–18 lbs | Large breeds (Maine Coon males, Savannah cats) |
| XL | 18+ lbs | Extra-large cats (record-size Maine Coons) |
Cat breeds that often need special sizing
Some cat breeds have body shapes that don't fit standard size charts well:
- Maine Coons: Large, long-bodied cats that may need Large or XL despite weighing 12–15 pounds
- Ragdolls: Heavy but floppy — their loose skin means chest measurements are critical
- Siamese & Orientals: Slim, long-bodied cats that may need length adjustments
- Scottish Folds: Stockier builds with wider chests for their weight
- Sphynx: Lack of fur means clothing fit is more visible — precision matters more
Measuring a cat that won't cooperate
Most cats won't stand still for this. What works:
- Measure while sleeping: Gently measure your cat when they're relaxed or napping
- Use a collar as reference: If your cat wears a fitted collar, measure that for neck size
- String method: Loop a loose string around the chest, mark it, then measure the string
- Two-person job: One person distracts with treats while the other measures
When to go custom
Some makers offer custom sizing — 19 size options, $15–$60 depending on fabric. Worth it if your cat is between standard sizes, has unusual proportions, or is a Sphynx where fit shows.
Before you order
- Measure: Neck, chest, and back length — not weight
- Check the chart: Compare to the specific brand's guide
- Size up if between: Looser beats too tight
- Check returns: Verify you can exchange
Mango's chest was 12 inches. That put him in Medium despite weighing 11 pounds. The Small I'd guessed at never would have worked.
If your cat shows signs of discomfort, restricted movement, or skin irritation from clothing, remove it immediately and consult your vet. Some cats are not suited to wearing clothing and should not be forced.