Spring/Summer is the time of the year where the weather is warmer and therefore one has to wear few layers and fresh clothing. For this season there is nothing better than a linen or cotton shirt, like the ones worn by Alain Delon. Bright and light colors are recommended, and if the shirt has an interesting design it's a plus, but a simple shirt can still make you look elegant.
Orange is a great color for this season, just try to keep it subtle and not too flashy.
On the set of "La Piscine" Alain Delon decided to add the finishing touches to his outfit with this tortoise square framed sunglasses.