The tasks a Fabric Repairer is expected to perform include:

Examining fabrics
Repairing faults in textile fabrics by plucking out knots and replacing broken or imperfect threads using hand tools
Inspecting fabrics for markings that indicate faults
Plucking out knots with hand tool and gathering up slacks on loosely woven threads
Replacing broken or imperfect threads such as to make repair invisible