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She used silk thread to sew her clothes.
Literal
She [topic-は] her own clothes [object-を] sew [for purpose-のに] silk-thread [object-を] used.
~のに (the nominalizer の + the purpose-marker に) attaches to a verb's plain form to mean 'for the purpose of doing X / in order to do X.' Distinct in feel from ~ために: ~のに focuses on the practical purpose of using something concrete, while ~ために is broader and more abstract. 絹糸 ('silk thread') compounds 絹 (silk) + 糸 (thread). 縫う ('to sew') is the everyday verb for stitching with a needle.