A waistcoat and blue jeans are powerful sartorial weapons in any modern gent's arsenal. This combination is also ideal if you're looking for hot weather wear to make a boring day more bearable. As you see here, well into your 30s you have a vast array of sartorial options.
Blue Jeans with Waistcoat Smart Casual Summer Outfits In Their 30s
This outfit shows that it is totally worth investing in such menswear pieces as a waistcoat and blue jeans. No doubt, it's easier to work through a hot hot weather afternoon in a easy and breezy getup such as this one. A great example for gents on a mission to move their style towards maturity.