Brands love bundling. "Buy two, get one 20% off" sounds like a deal, but it can nudge you into buying tees you don't need. For weekend-only wear, you might not need three new tees. The real question is: does the bundle lower the cost per wear? If you'll wear one tee all summer, a single quality tee at full price beats three cheap ones you'll retire by August.

Windbar occasionally offers bundles, but they're not the point. The point is to calculate cost per wear. A $45 tee worn 30 times a year for two years costs about 75 cents per wear. That's cheap. A $15 budget tee worn 10 times before fading costs $1.50 per wear. Suddenly, the premium tee looks smarter.

Another trick: free shipping thresholds. If you're one tee away from free shipping, it's tempting to add another. But resist if it's not a style you'll actually wear. Shipping costs are usually less than the price of an unwanted tee.