Because the muscles in your upper body are not fully developed, you have not yet reached your genetic potential of upper body width. (chestsculpting.com)
Overall body width and length are good but waist position is too high and waist rides up and uncomfortable. (backcountry.com)
The increase in body width has afforded an additional 29 mm in shoulder room, while rear seat legroom is up 26 mm. (motoring.com.au)