Glad to hear the J Crew pants worked for you, Lisa.
J Crew is one US online retailer that regularly has my business because I get a good fit in their pants and tops. Once I figured out my size, and as long as I read the reviews and descriptions carefully, I usually get the fit right. It also helps to get to their stores every now and again for a marathon try-on of different styles in a variety of sizes. If I go mid-week when the schools are in session, the stores aren't busy and the sales associates usually get a kick out of bringing me piles of things to try on, along with bottles of water and even the odd coffee to help keep my stamina up.
Elizabeth P, I find my BR size in pants is usually a good starting point for my J Crew pants. Occasionally I'll size up if the style is described as very skinny, or if it is a collection item, because I don't like my pants to fit too tightly. Same goes for tops, but, if the style is described as loose or boxy, I size down unless I want a really voluminous look. And, oddly, the one time I bought shorts in J Crew Factory outlet, I needed to size down because my regular J Crew size was huge. I don't know if that was an anomaly because it's the only time I've ever bought from their outlet.