Cashmere – Fibres measuring 14.5 microns in diameter trap heat for warmth. Don’t be fleeced by the lower-grade wool, which leaves a residue when rubbed.
Merino – Ultra-fine (below 15 microns) belongs next to your skin. Its sweat-wicking qualities make merino nature’s – and hipster cyclists’ – base layer.
Cotton – With sweat-sucking, breezy cotton, Ts in 4.3oz (oz per square yard) occupy the sweet spot between light and transparent; save 6.1oz for winter.
Linen – Absorbs up to a fifth of its weight in water, so a 5oz shirt can wick perspiration. For tailoring, go heavier – around 8oz – to avoid wrinkles.
Denim – A 14oz is your go-to; above 16oz will give you sweet fades but less-sweet chafing; Naked & Famous’ 32oz jeans can stand up by themselves.