I have two kinds of forms from the breastform store online - size 5 silicone forms and size 6 foam travel forms. I am 5'10 with a 38" chest and these forms seem to correspond to a C cup - they look natural with most kinds of blouses and dresses I've worn. (tip - I went down one size from the charts posted online and have been very happy with the natural looking appearance of the forms)
