Thor Ewing on Twitter: "@CatJarman I don't know of anything directly comparable. In 'Viking Clothing' (p106-7, p109) I suggest these 'knappar' might not be buttons-as-clasps but purely decorative fittings from a 'slæðr'
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PDF) 'í litklæðum' – Coloured Clothes in Medieval Scandinavian Literature and Archaeology | John Thor Ewing - Academia.edu