I found this shirt to be tight across the back so I sized up. I'm usually a size 16 but I had to size up to an 18. The 18 has more room across the shoulders but it also means there is extra room around the front so its a little big across the tummy and a little short in the length at the front. I love the Gingham and get compliments everytime I wear this shirt (especially the yellow). It's lightweight, great in summer, washes well and the material lasts. I've had mine for about 12 months now and they are still in good condition.