Finding your perfect T-shirt size can be a bit tricky, but it's definitely worth it to get the right fit. Here are a few tips to help you out: 1. Measure your bust and waist size. This is the best way to find your approximate T-shirt size. 2. Try on different sizes in store. It's important to get a feel for which size is best for you. 3. Consider the style of T-shirt. Some styles are more fitted than others, so you may need to go up or down a size depending on the style. 4. Don't be afraid to go up a size if you're in between two sizes. A little bit of extra room never hurts!