Cool
If it's a bit loose, when you wash it it will shrink...but usually will stretch out a bit over the day...
If it's too long you can usually take in a bit on the snap panel or alike...
I wish they had onesies with a couple rows of snaps, that would be great!
Sizing aside, they do work for hiding your diaper, and keeping it in place as well...
I usually where shorts, although I haven't been in any real clothes for some time due to some medical issues and alike...but hopefully soon be back walking good, and wearing my regular onesies and such...
I have onesies from baby pants, and 4care...I like the 4care the best for fit, although the baby pants ones are thicker and warmer...
It takes a bit to get the right one, I myself have taken in the baby pants ones (width not length) as I like them skin tight, along with all base layer of clothing...and pajamas too must be tight as well, although I have nerve damage and my feel isn't normal...
Let us know how the fit is after a wash and dry..