Is this blazer true to an XL?

The listing gives a 24-inch pit-to-pit measurement and describes the fit as XL. Compare that flat measurement with a blazer you already own, since vintage cuts run roomier than modern ones.

It is 98% wool, with the remaining 2% not stated. Wool gives it structure and warmth but little stretch.

What condition is it in?

It is described as very good pre-owned condition. That means it has been worn but shows no major damage; ask the seller about specific flaws if you need detail.

Is it a women's or men's blazer?

It is listed as a women's blazer from the 1990s. The cut follows Armani's women's tailoring of that era.

Can I wear it as a suit jacket?

It is a single blazer with no matching trousers. It works as a separate over jeans, trousers or a dress.

How does it compare with a new Armani blazer?

You get the same house name and wool tailoring from the 1990s, but without modern stretch blends or a brand warranty. Check the measurements, since vintage sizing differs.