Most of what I can see in period art seems to show archers in the last quarter of the 14th century wearing long sleeved gambesons. However there are some examples of short sleeve and sleeveless gambesons being worn in this time period as well. Do we have any documents or sources which point toward vented armpit or stitched shoulder gambesons during this period?

I was told that vented armpits are a "re-enactism".
However, i recently encountered this picture and there they are:

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Well, well, well. How interesting! Care to share the dates on this piece?

Also, note the chainmail UNDER the gambeson. And the 'jack chains' on the arms and the 'skull cap' helm. ;) Those details might go a long way on a reconstruction of a period kit, which I'm thinking is Late 15th-Early 16th c. I could be a bit off on that though. :) If I'm wrong, someone please correct me. :\ .....McM

Mart is becoming a personal hero of mine lol. It makes total sense that this would be a jack - especially since it is accompanied by jack chains.

So what do we know about multi color gambesons being a thing in period? On some modern sites I see quartered gambesons being sold that look very nice, but in manuscripts I’m only seeing solid color, or some two-toned examples - and really only in France. I’ve also found an example of a quilted gambeson much earlier than I thought they came about. Can’t currently upload the files from phone as they’re too large. Will hopefully be able to edit and upload later.