bends > {Flat strips, straps, bands} entailed > carved; ornamented; intaglioed
5 With curious antics, and full fair amelled:
antics > {Fantastic or grotesque representations of birds, animals, plants} full fair amelled > very becomingly enamelled
6 Before they fastened were under her knee
Before > In front
7 In a rich jewel, and therein entrailed
In > [With] entrailed > were intertwined
8 The ends of all their knots, that none might see
that > [so that]
9 How they within their foldings close enwrapped be.