Your border icon display for every colour is wrong tho. You either fix the icon border png file (You have one extra pixel line in the beggining) or you just modify your ColorBox icon-clip from this:
Code:
ColorBox < UICheckBox
size: 16 16
image-source:
icon: /images/ui/colorbox-border
icon-clip: 0 0 12 12
$checked:
icon-clip: 0 12 12 12
to this:
Code:
ColorBox < UICheckBox
size: 16 16
image-source:
icon: /images/ui/colorbox-border
icon-clip: 0 1 12 12
$checked:
icon-clip: 0 13 12 12
Also the outfit panel window size should be 68x68, not 69x69.
Very nice job

I've been working on mine since a year too so i know what you've been passing through xd.