These are the size charts according to the Gildan website for the SoftStyle line.

Women's

Measurement (inches)	Width	Length
Small	16	23.5
Medium	17	24.5
Large	18	25
X-Large	19	25.5

Men's

Measurement (inches)	Width	Length
Small	18	26.625
Medium	20	27.625
Large	22	28.625
X-Large	24	29.625