They'll need an overlocker/overlocking sewing machine
Overlockers sew over the edges of fabric to resist fraying, such as around the edges of the internal part of front pockets, or internal seams. I would have thought a flatbed personally as rear pockets are usually sewn on flat.
This is the kind of repair I'm thinking of.
@Black_Rainbow_Project started
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They'll need an overlocker/overlocking sewing machine