I should say that spring and summer are likely to traverse with more colours and lighter fabrics, especially bright colours and lighter fabrics; which allow us to feel the comfort and essence of the spring and summer weather.
particularly in summer, I would love to wear dusty pink, aquamarine blue, pale yellow and orange and of course navy blue, beige, cream, white, and a few shades of browns and green colours.
However, interms of fabric always stick with natural fibres cotton, linen, seersucker, silk, chambray, hopsack, etc.
I perceive as a man most of us in most of the time-limited our colour palette and we always go around it; of course, we don't have much as a woman does; yet we have some beautiful colours to try out beyond our circle hence I would suggest you add some beautiful colours into your summer wardrobe collections.
Perhaps it could be little accessories like a necktie, pocket square, bandanas (scarf), or on the other hand a summer suit, odd trousers, blazer, sport coat, Shacket (an overshirt), safari and Teba jacket,
and as leisurewear a pair of linen or cotton shorts and a polo T-shirt or camp collar shirt, band collar shirt (linen/ cotton).
In summer, I prefer to wear knitted ties because it's pretty light and breathable, you could also try Grenadine ties and silk ties which are better if it is folded rather than havening a piece of canvas inside.
Moreover, if you have been invited to black-tie or any special formal occasions you could be cool, classy and elegant with a white dinner jacket (click here to read more about it).
Interms of footwear for summer preferably to wear loafers/ slip-on; for black-tie attire or any other formal occasion in the evening, I suggest you wear a pair of velvet slip-on or patent leather Belgian loafers are the quite best options and in the daytime penny, tassel loafers are the quite versatile option which you could wear with your everyday business outfit and casual outfit as well
Although, if I intended to wear lace-up shoes then I would prefer to wear a pair of brown spectator shoes rather than white sneakers; which gives a classic touch and a flamboyant look.
However, the horse bit loafers are also a quite nice choice for a semi-formal and business-casual look also it goes well with denim jeans and chinos, the moccasins and espadrilles are the best way to wear them with your casual outfits.
Especially, a pair of espadrilles is a pretty good option; they are quite soft and breathable and also available in various colours and prints, though you could wear them with your linen suit or linen odd trousers with a polo t-shirt and layered with a linen safari jacket/ Teba jacket; would create the look much more casual.