This is a stained glass window, and of course, there is plenty of artistic licence going on here.
Details I really like on the left hand picture of St. George...the chain mail covering the gorget, the fancy straps on the legs, the gold arming points which hold the shoulder armour in place. The two piece greaves which are pinned at the front.
The right hand picture of the angel spearing demons like a fisherman spearing octopus...really cool features would include the chains which are designed to prevent weapons from getting lost, and the blue armour with gold detailing. One might feel that the armour is rather limited until you realize that in fact the armour is all there, just inside that nice robe.
This artist was working from real originals.