I wear a suit almost every day (probably more than 9 days every two weeks). I find it easier to match. When I try to wear a sport coat, it just seems too complicated so early in the morning. My "casual days" will be a Navy Blazer. I have about 10 winter suits in rotation, and about the same for summer, with 2-3 all season suits. More in the closet that I occassionally wear--2 or three times a year.