The new custom and jersey Photoshop/GIMP template has been submitted to PadreFan' s site. The link can be found in my signature as Jersey and Cap GIMP/Photoshop Templates.
Here is the readme file:
Deft and No Peppers Custom Jersey and Cap Templates for OOTP2007+
Overview:
This is a template to be used with a layer supported graphics program (GIMP, Photoshop,etc..) to make custom uniforms and cap for OOTP2007+.
By turning on layers and changing colors a multitude of uniform options can be attained for anything from 19th Century jerseys to modern era MLB teams.
None of these files are supported, connected to Photoshop or
OOTP, or for sale so use at your own risk

Updates from JerseyTemplate_V1.0
-Added a Cap Template
-Added No Pepper's Collection of Vintage Cap and Jersey template
-Added New Textures and Shadows
-Added a tight fitting vintage cap
-Added a stingy brim cap
Instructions:
Jersey Instructions.
create a team template:
1) Using a layer supported graphics program (GIMP, Photoshop,etc..), open the jersey_template file and select the layer you like best
2) Change the colors by either changing the layer blending color or the solid fill color.
3) Make sure the sleeves, collar and main jersey front and back are at the minimum active before saving.
4) Add Logo or Text in the logo layer, this can be moved down below textures and shadows for a more subtle appearance
5) Save as a .png file
6) Once saved load in game or used the customization section from the manual to automatically load in the game.
Cap Instructions.
Follow same format as the jersey except when making caps only use layers from the layer set of the cap you are using.