Women's belts aren't directly evidenced, but are worn based on supposition.
Gale Owen-Crocker is clear in Dress in Anglo-Saxon England that "In some illustrations the gown hangs loose, in others it appears to be pouched over the hips, as if over a concealed girdle. Some figures wearing the draped, sleeveless, outer garment appear to have a broad, self-coloured sash at the waist. A diagonal line suggests that the sash may be wrapped round twice or arranged with a twist in it (Fig 174). A rather different impression is given by a crucifixion painting which includes a kneeling woman, perhaps Judith of Flanders, at the foot of Christ’s cross (Fig 178). The body of the figure, unlike most Anglo-Saxon pictures of women, is in profile. A tight belt is visible at the front of her gown, cinching the fabric to show off her waist, but it does not seem to continue round the back. The only parallel known to this author is on the earlier Genoels-Elderen Diptych (Fig 110) [10th c].
There are never, in late Anglo-Saxon art, any pendant girdle ends with or without strap tags, nor are there any buckles. No tools or personal ornaments hang from the girdle or sash."
It's therefore recommended that women wear a long fabric belt, fastened with a knot.
In the past there's been a somewhat artificial divide whereby the society was happy for Viking women to wear leather belts the same as men's, and Anglo-Saxons to wear fittingless cloth belts or tablet woven belts with or without buckle and strap end. This appears to be a reenactorism, but continues to be considered acceptable.