What does "sewing thread" mean?

[Denny]

English Idioms and Expressions, Advanced Level

ESL/EFL Test #43 "American Slang Words (17)", question 5

Marcel just bought some new threads at that trendy store downtown.

(a) sewing material
(b) sewing thread
(c) clothes

English Idioms and Expressions, Advanced Level

ESL/EFL Test #43 "American Slang Words (17)", answer 5

Marcel just bought some new clothes at that trendy store downtown.

Correct answer: (c) clothes

Your answer was: incorrect
Marcel just bought some new sewing thread at that trendy store downtown.
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What does sewing thread mean?

Denny

[Linda]

Hello Denny,
Sewing thread is a thin, continuous strand of material that you can buy on a spool. It's the fine, string-like material that people use when they sew fabrics together. Thread is used to keep fabrics together.
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