In short, your t-shirt should last a long time with a little love and tender care. Here’s our love-you-long-time guide: 1. Turn your threads inside out.  2. Machine washing is totally fine, but try and make sure it’s a cold wash and a gentle cycle.  3. You can throw them in the dryer, but it’s much better to air dry.  4. There’ll be some minor shrinkage after washing, which is standard cotton 101—a bit like your standards when you’re still single at thirty.