This is a solid and well made soft shell vest.  I bought a medium.  Laying flat, the bust is 19 across from armpit to armpit or about 38 total.  The size is consistent with the sizing spec sheet I attached for this L325 Port Authority item.  The hip is about 20.5 when measured along the bottom of the garment (again lying flat) or about 41 total.  The length is approximately 25 from the collar to the bottom of the vest when measured down the back.  I would say this item is true to size.  I would reference the sizing sheet for guidance on sizing Port Authority items.  It is a polyester vest with no stretch.  If in doubt on the size, I would say go up to accommodate for the lack of stretch.  I am normally a small, but purchased a medium to have a slight amount of room to wear thick sweaters underneath the vest.  I got the gray color, which is a nice shade that is true to the photo.  Other than that, the info below is also from the spec sheet regarding fabric content and washing instructions.

Keep your core warm and protected from the elements in this versatile vest that's easy on the budget.

*100% polyester woven shell bonded to a water-resistant film insert and a 100% polyester microfleece lining
*1000MM fabric waterproof rating
*1000G/M2 fabric breathability rating
*Reverse coil zippers
*Zip-through cadet collar with chin guard
*Front zippered pockets
*Open hem

CARE INSTRUCTIONS
Machine wash cold with like colors, only non-chlorine bleach when needed. Tumble dry medium. Cool iron if necessary.