Let's get straight to it — here's what actually matters on this one.

• Wool naturally resists wrinkles, holds its shape over years, and breathes surprisingly well due to its fiber structure — it lasts longer with proper care.
• Cotton blazers are more casual and breathable in heat but lose structure faster and wrinkle more without frequent care.
• Wool is more resistant to odor buildup naturally, needing less frequent cleaning than cotton, which extends its practical lifespan.
• For year-round versatility and longevity, wool is generally the stronger investment; cotton suits warmer climates and more casual settings.

The fit-and-fabric-health takeaway: Wool's natural fiber structure gives it both a longer usable life and better temperature regulation against skin than most people expect.

Next up: check out our guide on whether rayon or cotton is better for Indian summers.