Business casual sits between formal and casual — the default in most tech, media, and modern corporate offices. Chinos, blazers, polo shirts, and clean sneakers are typical. No formal tie required. Fabric range is wider: cotton, linen, jersey, and merino all qualify. The key constraint is no visible wear (no distressed denim, no gym fabrics). Climate significantly affects choices: linen dominates in tropical business-casual; merino works year-round in temperate climates.