Katy Perry is taking a trip down memory lane with her latest look.

Through her charity, the Firework Foundation (founded in 2018), she has begun a 21-day sweepstakes during which she plans to auction off part of her on-stage wardrobe from concerts past.

Preparing to put up some of her iconic looks up for grabs, Perry pulled one out of her archive to wear one last time.

Perry performed at Cardiff Castle in Wales on Tuesday, wearing a bold two-piece set that she previously wore 17 years prior.

Perry, 41, hit the stage in a red and white polka-dot halter bralette and miniskirt styled with thigh-high white socks and a pair of black platform sandals.

The look was last worn at the Capital Summertime Ball at Emirates Stadium in London in July 2009.

Perry also had a quick change, wearing a white button-down shirt as a dress that read “I am not a robot” with a crystal-embellished American flag tie.

She shared both looks on Instagram after the concert, writing, “Learned a wee bit of Welsh. Good to see you again Cardigg and rydw I’n llwglyd ac hoffwn gael cabab ♥️.”

New looks will continue to be dropped as part of the sweepstakes, though so far included are four additional bustier tops and miniskirts, from her blue sequin stage look to the pink ruffled two-piece set, both worn during her 2009 “Hello Katy” look.

Perry is currently making performances throughout Europe for her “Out of Office Tour” festival tour, unveiling a new archival look each night.