More than £300 of jumpers were stolen from Next at the Methuen Retail Park, Chippenham, on Saturday at 1.55pm.
A witness alerted the store after a man and two women were seen getting into a blue Ford Focus apparently with the items.
Anyone with information should contact Wiltshire Police via 101 or Crimestoppers on 0800 555 111, where information can be left anonymously.
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