I said a more in-depth thing here.
And I am glad this didn't happen this time! And I hope it continues to not happen!
Basically, don't add new things to/change things that are purely aesthetic after they're released. Statistics/combat factors, fine, as the game evolves, so to does the balance of items. But not the looks of things that have already been released. Please noe. A lot of people, especially in SK, pay to get something because it looks a certain way. Change that and you might just ruin why someone spent money on your design. And that's a bad bad road. A new design should have a new, slightly different name, simple as that, and old things get to stay.
So, I really am glad you guys did NOT add the checkered pattern to the old Battle Chef items (compared to adding the flappy fabric to the old tabards and not just the new). Very glad.
That being said, I wouldn't mind seeing a "Blue Checkered Battle Chef Hat" and so on ;P. Just leave the "Blue Battle Chef Hat" alone :D