I’m not sure who came up with the system for sizing up clothes but its pretty simple for men. We have S,M,L,XL,XXL and so on for shirts, and pants are based on your waist size and leg length. Simple.
Women’s clothing is just a random number. As if size 16 pants means anything logical. Plus it changes based on designer.
Then there is baby clothing that is based off the age of your baby. Except that only works if all babies come out the same size; which they don’t.
Some clothes that are for 4 month old babies are to big for our 5 month old little girl; whereas others that are for 12 month old babies fit just fine.
Why? Why does this have to be so difficult? Maybe baby clothes should be based on weight, not on months old. That would still cause issues with length, but at least it’d be a bit more logical.
For now, we just put on whatever fits. Doesn’t matter to me if it’s for 5 month old babies or 12 month. If it fits, she wears it, and she spits up on it. That’s keeping it simple.