Shortly before noon, the three women grabbed armfuls of bras and then fled from the Victoria's Secret store in Puyallup's South Hill Mall.
Puyallup Deputy Police Chief Dave McDonald says the store manager tried to stop them, but she was punched by all three women and sprayed in the face with some unknown substance. She sustained minor injuries.
Officers were not able to catch the suspects, but are following a lead on a vehicle and partial license plate number after witnesses saw them drive off in a blue Ford Explorer.
There was no surveillance video footage of the robbery, so no photos of the suspects were available.
McDonald said the suspects may try to sell the merchandise on eBay or similar website. About 150 bras were stolen with an estimated value of about $8,000, he said.
He said all the "bra bandits" were women in their early to mid-20s who are not believed to be linked to any other crimes in the area.
"Bra bandits - yes, it has a certain ring to it," he said.