Before that discussion, I had been aware that there have been heated discussions among reenactors and historical costumers about whether the Vikings used lucets or not, but I didn't really know what support existed for the hypothesis that they used such devices. It turns out that the most solid piece of evidence for the use of lucets in the Viking era comes from a grave find at Barshalder, in Sweden, which was the subject of an article by Kerstin Pettersson. Here's the full citation of her article, for the curious:
Kerstin Pettersson, "En gotländsk kvinnas dräkt. Kring ett textilfynd från vikingatiden," Tor 12, 1967-1968. Societas Archaeologica Upsaliensis, Uppsala, pp. 174 - 200.
Ms. Pettersson's article (of which I have obtained the gist primarily from the English-captions on the accompanying photographs, since the text itself is in Swedish) discusses two pieces of cord found in the grave, one of which apparently held beads, and the other of which appeared to be fastened to one of the tortoise brooches in the grave in a position that suggested a shoulder strap. Whether such cords were used for straps on apron dresses, however, is not the part of the discussion I'm focusing on right now. What I'm interested in is the evidence for the use of lucets in the Viking era, and what a "Viking lucet" might have looked like.
The Barshalder cords have a square cross-section, like the
cord made by lucets, according to Sandy Sempel of Frojel Gotlandica, who has had an opportunity to see them in person. Like lucet cord and
unlike cords made by fingerlooping, the Barshalder cords appear to be made from one continuous length of string. It seems likely that, if cord with the property of lucet cord is found in a Viking era grave, that the Vikings had a device that could make such cord.
Bone lucets from Jorvik (York), World of Vikings CD-ROM
Bone lucet with runes from Skåne, Sweden, World of Vikings CD-ROM
Sources:
Kerstin Pettersson, "En gotländsk kvinnas dräkt. Kring ett textilfynd från vikingatiden,"
Tor 12, 1967-1968. Societas Archaeologica Upsaliensis, Uppsala, pp. 174 - 200.