The 23-year-old, who is on Red World Tour, looks for smart yet practical clothes, reports a website.
"For performance, I'm not only looking for something that looks cool in front of 20,000 people but it's also about the functionality of it, can I run around in it? Can I throw my hair around in it?" she said to a magazine.
"My favourite look of the show is when I start out with black high waisted shorts, and lace Oxford shirt and sparkly red oxford shoes, and a black hat,” she added.