Clockwise, from left:
Vince Rhodes Slim Straight Jean in Pewter ($195). While these are technically labeled as a "jean", they are lighter in weight, with a color that really places them in the Chino family. There are a lot of opportunities to dress them up or down, depending on the shoes (see ideas below with Scotch & Soda slacks) and shirt. If you're planning to wear it tucked in, I'd include a belt, even just a something casual, like this Patagonia Tech Web Belt ($29) with built in bottle opener.
Scotch & Soda Relaxed Slim Fit Chino in Sand ($139). A true summer classic. Roll the cuffs to keep it current, make it casual by pairing with white sneakers. Try Converse Jack Purcells, Adidas Rod Lavers, or maybe a pair of Tretorns.
Save Khaki Pointelle Sweatpant in Marine ($90). Just discovered this brand, a new favorite, for their soft knits and made in the USA. The Pointelle knit, rather than more typical fleece, makes them more versatile.
Rapha Randonnee in Light Blue ($140). These technical city shorts are made to perform in hot and humid conditions, with enough style and tailoring to keep you looking fresh after a spin around town.