Undergarment here, waistcoat in the US (4)

I believe the answer is:

vest

(Other definitions for vest that I've seen before include "Garment under a shirt" , "Undergarment for upper body" , "Undergarment for vets" , "Clothe in ecclesiastical garments" , "Upper undergarment, singlet" .)

I've seen this clue in The Irish Times.

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