Replacing your trusted trainers with a pair of loafers is an easy way to add an element of sartorial city smart to a casual cotton suit. When putting an outfit together the general rule is that brown warms up an outfit, giving a sophisticated tonal effect.
For a lighter summery look, consider materials such as suede and replace black with navy and brown. Straight-fit trousers with more width in the leg opening give a nice drape; slimmer styles should finish slightly higher, skimming the top of the shoe. For a more casual look consider pairing your choice of casual shoes with a chino and rolling them up just above the ankle.