So, you've got your mail shirt and your gambeson. How effective would that be against a typical military crossbow at short range (say 12m)?
Andreas Bichler has done some tests and packaged them in a polished Youtube video (https://www.youtube.com/watch?v=vvMm4jM49ig) to show you. He also, inter alia, shows you loading a crossbow with a belt hook.
For those don't know of Bichler, he is one of the main authorities on crossbow reconstruction.
Fair warning for those of a delicate disposition - he shoots at a genuine 16th century mailshirt in one test.
There are some useful numbers in the video (draw weights, impact energy) for those interested in such things (like me :) )
12 metres.....ouch