I bought 3 of these "Women Within Perfect Crewneck Tee's" in size 2x. The sizing is generous by todays sizing standards but a normal thing for the Women Within brand. The size you buy in the stores will be a larger size usually then you buy from WW: maybe consider going down 1 to 2 sizes depending on the style of the item.  I also like that they are longer than most tee shirts as well. They are very soft and the colors seem to stay true after many washings.

I like them so much, I just bought 4 more but in the V neck style. These shirts come in 4 different neck styles and many colors.