。
Sewing is handwork.
Literal
Sewing [topic-は] handwork
The copula is dropped entirely, leaving a 体言止め (noun-ending) construction common in titles, headlines, poetic fragments, and terse writing. Dropping the copula makes the line feel like a heading or an aphorism. 縫い物 ('sewing') and 手仕事 ('handwork / handcraft') are both compounds — the second is also used to dignify traditional crafts as work done with one's hands rather than by machine.