Underarm to underarm is 24”. The Quacker Factory Vintage Denim Lighthouse Shirt for women in XL size is a charming button-up top featuring embroidered ocean and lighthouse designs on blue denim fabric. This stylish shirt is perfect for those who appreciate vintage-inspired fashion with a nautical theme. Made by the well-known brand Quacker Factory, this top is sure to add a touch of coastal flair to any outfit.