If you are within striking distance of Somerset, NJ there is Paddlesport coming up on March 27-29. There certainly will be a wide assortment of PFDs to try on. Because kayaks are so much more popular these days than canoes most of the PFDs offered are intended for kayaks where you are sitting and leaning back on the seat back rather than kneeling or sitting on a canoe seat. The freedom of movement required for single blade vs double blade kayak paddle also effects how comfortable the PFD will feel. If the PDF is not comfortable you are less inclined to wear it. Kids especially will fight using it if it's not comfortable. So as others have said, go try them on.
Jim