Diaper covers ect

Longies/shorties/diaper covers, just wondering if they all serve the same purpose. There are a million and one free patterns on line but the problem with free is that there usually is some sort of glitch in the pattern. So I have had to adjust/ rip out/ re-adjust, until I think it's right.
I also have a problem with working with felting real 100% wool. I have no clue and will let Amelia deal with that, these may shrink up enough to fit her smallest doll. She can do what she wants with them, trade/ toss what ever, I don't mind, this is good practice for me and I will sooner or later learn where I went wrong :-(