This article offers an account of the components, the structure and the history of the so-called casula and velamina of Sts Harlindis and Relindis preserved at the Church of St Catherine at Maaseik in Belgium as relics of the two sisters who founded the nearby abbey of Aldeneik (where the textiles were kept throughout the Middle Ages). The composite casula of Sts Harlindis and Relindis includes the earliest surviving group of Anglo-Saxon embroideries, dating to the late eighth century or the early ninth. Probably similarly Anglo-Saxon, a set of silk tablet-woven braids brocaded with gold associated with the embroideries offers a missing link in the surviving corpus of Anglo-Saxon braids. The ‘David silk’ with its Latin inscription and distinctly western European design dating from the eighth century or the early ninth offers a rare witness to the art of silk-weaving in the West at so early a date. The velamen of St Harlindis, more or less intact, represents a remarkable early medieval vestment, garment or cloth made up of two types of woven silk cloths, tablet-woven braids brocaded with gold, gilded copper bosses, pearls and beads. The velamen of St Relindis, in contrast, represents the stripped remains—reduced to the lining and the fringed ends—of another composite textile. Originally it was probably luxurious, so as to match the two other composite early medieval textile relics from Aldeneik. As a whole, the group contributes greatly to knowledge of early medieval textiles of various kinds.