Other key pieces: A do-it-all blazer, a grown-up graphic T-shirt, and a summer scarf.

Blazer: This Yohji Yamamoto Y3 blazer is sporty but has enough style to easily get you through cocktails and dinner. Because of the lightweight Gortex fabric, it’s easy to pack and is rainproof $1,035 at adidas.com. T-shirt: Works with a jacket and scarf or perks up casual pants. Gray, black... Bill Hogan/Tribune