If the setting permits off-duty style, consider wearing a light blue long sleeve shirt and beige shorts. A pair of purple canvas low top sneakers finishes off this outfit very well. This ensemble shows that as a gent in his forties, you have a wide range of sartorial options.
This casual combo of a light blue long sleeve shirt and beige shorts is a fail-safe option when you need to look good but have no extra time to pick out a look. Complement this ensemble with black leather boat shoes and ta-da: your look is complete. This outfit illustrates that in your 40s you still have a wide range of sartorial options.