Did CRUSADERS wear SURCOATS because of the SUN on their Chainmail Armor?

In many places you will hear that the crusaders started wearing surcoats over their armor due to the heat of the sun. But in the age of mail (AKA chainmail) does this even make any sense? 3 extra videos each month on Patreon, which hugely helps support this channel:   / scholagladiatoria   Facebook & Twitter updates, info and fun:   / historicalfencing     / scholagladiato1   Schola Gladiatoria HEMA - sword fighting classes in the UK: https://www.swordfightinglondon.com Matt Easton's website & Pinterest: https://www.matt-easton.co.uk/ https://www.pinterest.co.uk/matt_east... Easton Antique Arms: https://www.antique-swords.co.uk/