This is a vintage men's blue "G Line" suit jacket from Armani Collezioni in size 50R.
The jacket measures approximately 21" underarm to underarm, 17.25" shoulder to shoulder, 28.75" from the back of the neck to the bottom hemline, 19.5" across the waist, 27" shoulder to hem, and 23.5" shoulder to sleeve/cuff opening when laid flat.
The jacket comes in good pre-owned condition with a tiny faint pink spot stain near the right lapel.