Is a 90% wool, 10% cashmere coat warm enough for winter?

Yes for cold, dry city days, especially over a sweater. The wool does the insulating and the cashmere softens it. It is not a substitute for a waterproof shell in wet or windy weather.

How should I care for a wool-cashmere coat?

Brush it after wear and air it rather than washing it often. Follow the care label; most wool-cashmere coats are dry clean only. Store it on a wide hanger to keep the shoulders in shape.

Will the cashmere make it pill?

Cashmere blends can pill where sleeves rub against the body or a bag strap. Remove pills with a fabric comb rather than pulling them. Pilling usually settles after the first weeks of wear.

Does it work as a formal coat?

The button front and clean wool look suit office and smart-casual wear. It is less formal than a topcoat with a structured shoulder, so it fits business casual better than black tie.

What should I compare it against?

Compare the fiber percentages first: all-wool coats are hardier, higher-cashmere blends are softer but pill more. Check whether rivals add a full lining or a storm flap, which this one does not list.