Why is measurement varies between designs even though they have the same size code?

Yes, you will see different measurement even though they have the same size code. It is because each design varies in their cutting. Indeed, they are very much unique to each design in order to bring out the favor of it...

For example, a Polo design comes with a bigger chest size than a hip hood. It is because Polo is meant for loose fit, so it is always the best choice for a little furry like Maltese, Shih Zhu, etc; For hip hood, it is best choice for short-coat or skinny body like Schnauzer, poddle etc.

As for Doggie Tee, it's almost like an universe item, short body design that is meant for short-tuck... very cool oh~~

If you need suggestion, drop me an email, I will try my best to make recommendation. Hear from you soon~~