Is this blazer formal enough for a suit?

No. It is a soft, single-breasted sport coat in a check, so it works as a separate. Wear it with trousers or denim, not as part of a matched suit.

How does the cashmere, silk and viscose blend wear?

The blend feels soft and light with a matte finish. Cashmere-rich cloth pills and wrinkles more readily than pure wool, so rotate it and brush it after wear.

What colors pair with a gray check blazer?

Navy, charcoal, white and light blue shirts all work, as do dark denim and gray trousers. Avoid busy patterns that fight the check.

How should I care for it?

Dry clean only, and sparingly. Hang it on a broad hanger between wears and steam rather than press to keep the soft drape.

How does it fit compared with a structured wool blazer?

It is cut close but with minimal padding, so it follows the shoulder rather than building it up. Men who want a sharp, squared silhouette should size with that in mind.