I'll share this especially for the fighters in the hotter climes, I'm originally from Starkhafn as well. I took a net style football jersey and sewed padded panels across the shoulders, upper chest, and along the ribs. I attached normal gambeson sleeves at the shoulder seams. On the front and back I...

Go to your local fabric store and purchase a mens shirt pattern in your neck and chest dimensions. Extend the shirt pattern to the length that you desire for your gambeson. Ignore the collar and extra bits of the pattern. Take care to ensure enough length in the sleeves. I used this technique to mak...