Some candidates, like Democrat Marie Gluesenkamp Perez, who represents Washington's 3rd Congressional District, are embracing a relaxed, outdoorsy image.

The former car repair shop owner is up for re-election on a platform focused on support for small businesses and working families, after capturing a Republican-held seat in her state in 2022.

She favours low fuss, low-key work jackets, flannel shirts, jeans and practical footwear.

Robert Ordway, conservative public policy adviser and former owner of Capitol Hill Clothiers, says Gluesenkamp Perez is probably the most "spot-on" when it comes to "authenticity and where you come from".

"Also it really vibes with the Pacific Northwest, which has trees and forests and a little bit more of an outdoor vibe," he says.

Her style also "shepherds a message championing the working class", says Tashira Halyard, an attorney, content creator, and public policy expert based in Washington DC.