Hi!The only pair of 15th century separate mail sleeves that I have examined are much alike textile garments (sleeves) of the same type. There seem to be gussets at the elbow just like the Herjolfsnes 63
wich make the arm more mobile. They are also more narrow at the wrist than the upper sleeve. At the top they have a simlilar construction as the pourpoint of Charles de Blois (the sleeves covers a large part of the body, very near the front opening and the collar).
Nothing suggests any kind of attachment construction. They were probably sewn on to the textile garment.
/Henrik Summanen