Transitioning between season can be annoying, it’s either too hot or too cold and there is always a chance for rain and wind. The very first key to a good fall outfit is a rain coat, long enough to cover a suit, a classic trench in blue or brown for example. Nicely colored denim work well during sunny, yet windy days and add a touch of creativity.
A patterned sportscoat/blazer has the same effect as a layering piece, under the coat it creates visually interesting contrasts. Especially softer fabrics or blends work beautifully between the seasons, plus they feel comfortable.