Fretty is in Charges.

Fretty. A continuous fret, and forms a pattern for diapering the field, or some ordinary.

Marquess Donegal Arms. Quartering Chichester Arms and Etchingham azure fretty argent. Source.

Delves Arms. Argent, a chevron gules fretty or between three delves sable. Source.

Audley Arms. Gules, fretty. Source.