We have found the easiest way to determine your best size is to grab your favorite tee shirt and lay it flat on a table. We have a couple different styles of women's tees so make sure to grab one that most closely matches the fit you are looking for. Now, take a measuring tape and measure from the left to right chest about an inch or so under the armpits and take note of how many inches. This will be your BUST measurement. Now take your measuring tape and measure on the front of the tee from the center of the neck opening all the way down to the bottom of the tee. This measurement will be your LENGTH.
Now grab your measurements and compare them to our sizing chart located on each product page. The tee that most closely matches your measurements will be your best best (although their could be slight variances in styles). Between sizes? I would suggest ordering up for a loose and comfortable fitting tee!
As always, if you have any other questions or have trouble determining your best size, feel free to reach out to our awesome Customer Care department. We will be glad to assist you with any questions you might have!