A white suit and a white crew-neck t-shirt are among the unshakeable foundations of a good menswear collection. Go ahead and introduce a pair of low top sneakers to the mix for a more relaxed touch. So pay attention and be the sharpest dressed man among your peers.
This pairing of a white suit and a blue short sleeve shirt is a goofproof option when you need to look sharp in a flash. With footwear, go for something on the casual end of the spectrum and finish this ensemble with low top sneakers. Now that's how you do semi-formal over 40.