I have figured out that you can make the default wristbands larger by putting an edited file into the plcmn folder and name it e.g wr12. Take a look at this preview of Shaquille O'Neal's wristband:

So I have created a patch that makes all the default bands in the game larger.
You can download the BETA version here (Copy and paste url).
Please let me know what do think. Is this a necessary patch?