Stealing a pair of Calvin Klein boxers and a packet of socks worth a total of £25 earned one thief fines of just under £600 this week.
Piotr Marzec, of Russell Street, Luton, stole the items from The Mall last Wednesday but was arrested after being caught by security staff.
The following day he appeared before magistrates, who were told that Marzec was on court bail at the time of the offence.
Marzec, speaking through a translator, pleaded guilty to the charge.
He also admitted stealing a bottle of Chanel perfume from Debenhams on April 4.
Marzec was fined £225 and ordered to pay £370 in costs.