This phenomenen in the last couple of years has bugged me. Basically seem cheap jack clothing company are releasing county jerseys with varied "styles".
The Kerry version is almost the same as our hoopy Offaly jersey. You'll come across a few toolboxes at Kerry matches who wear them. I'd always go out of my way to pass a comment like "Are Offaly playing today?" or something to that effect.
Let us not forget. Offaly are the only county in Ireland who are allowed use a tricolour themed on the national flag. The dodgy clothing company and the folks who think they are buying a county jersey on the cheap must be sorted out!