Working with Custom Jerseys

I've watched a number of videos now and still can't get my head around the (probably) simple solution of being able to customise a jersey that wouldn't show any light issues.

Tried using GIMP and Photoshop.

I'm not sure what part of the DDS file causes it or how to remove it.

http://s27.postimg.org/bhc3ay7er/green_light.jpg

http://s27.postimg.org/air4ux4oz/lights.jpg

Is there a base I can work with that doesn't contain the highlighted areas?

Let me know if I need to explain myself futher.

Those jerseys do not have lighting issues, that is just the effects of the alpha layer.

Is there a good tutorial? The best one I could find was this one, and it really only speaks about changing colours that already exsit. Doesn't go much into alpha layers.
https://www.youtube.com/watch?v=WS19PA3Ef5w