NWOT Gigi Moda Made in Italy white linen blouse, size L/XL? (no size tag)

NWOT I received this beautiful lightweight, white pullover linen blouse as a birthday gift but it’s too big for me, and there’s no size tag to know if it’s a Large or Extra Large. Couldn’t exchange it because the giver had cut off the price tag (that probably had the size on it) before wrapping it up and giving to me. Is slightly longer in the front than the back, allowing you to tuck it into your waistband. Button is decorative, not functional. Measures approximately 24” across the front over the button from where the body curves into what looks like the armpit areas. Care tag states made in Italy and “100% lino” with symbols for care.