Width os 17" across, at where the armpits would be....kinda hard to say given that its a tank with spaghetti straps. However, they aren't the kind you tie...they are completely sewed in, and I didn't realize it until just now, but there's a zipper in the left side (as you're wearing it...not facing it). I'm glad you asked for measurements! The length is 18", from the dip in the front to the bottom. Hope the helps!