To find traditional Cartagena dresses, known as "trajes de Cartagena" or "mujeres de palenque" dresses, you can explore local markets, artisan shops, or boutiques in Cartagena. The Old Town, in particular, offers a variety of stores that specialize in traditional Colombian attire. Additionally, you may find vendors or artisans selling traditional dresses in popular tourist areas or during cultural festivals in Cartagena. These dresses often feature vibrant colors, intricate embroidery, and designs that represent the cultural heritage of the region.