US T Shirt sizes for references

I found a great guide on deciding the T-shirt sizes and pant sizes. Hope that helps you too:

For men

XXS   XS   S   M   L   XL   2XL   3XL   Chest (inches)   29-31   30-32   34-36   38-40   42-44   46-48   48-50   50-52   Waist (inches)   27-29   28-30   30-32   32-33   33-34   36-38   40-42   44-48

Source: https://www.americanapparel.net/sizing/default.asp?chart=mu.shirts&c=

For Women:

XXS   XS   S   M   L   XL   2XL       Size   00   0   0-2   4-6   8-10   12-14   16-18       Chest (inches)   26-28   28-30   30-32   32-34   36-38   40-42   44-46       Waist (inches)   20-22   23-24   25-26   27-28   30-32   33-35   36-38

https://www.americanapparel.net/sizing/default.asp?chart=womens.shirts