My Old Navy pricing experiment: How I became a part-time trader of socks, leggings, and T-shirts

I sought out the same pair of jeans in store to see how much they cost there (spoiler alert: it was more!).

Lily Oberstein/Business Insider

• I've become a day trader. But instead of stocks, I've been tracking leggings and jeans.
• Over the past two weeks, I tracked a cart full of basics at Old Navy to see how prices changed.
• Ultimately, my cart saw pricing swings; it's indicative of a new gamification of everyday shopping.

For the last week, I've been watching...