This combo of an olive crew-neck t-shirt and white jeans looks awesome and makes any gentleman look instantly cooler. Black leather monks will give a hint of refinement to an otherwise too-common getup. So if it's a blazing hot warm weather day and you want to look on-trend without exerting much effort, this outfit will do the job in next to no time. Definitely a savvy option if we're talking dressing ideas for gentlemen in their thirties.