In my younger working days I wore pantyhose almost everyday. I have not worn them in well over 15 years as I love wearing pants over dresses and skirts. My dilemma now is that I need to wear pantyhose with a dress I purchased for an important event (my DH requested - actually pleaded with me to get a dress instead of a pantsuit). I have absolutely no idea how to decipher sizing anymore. I am 5'7" and weigh 150 lbs and am not sure how to read the charts. Would it be better to size up rather than pick the size on the chart?