This is a large-sized harness vest. The vest features a red and white plaid pattern, with beige straps and trim.
 
Reflective: The packaging labels the harness as "REFLECTIVE".
 
Lining: The inside of the harness has a white mesh lining, possibly for breathability and comfort.
 
Straps and Fasteners: It has beige straps, a plastic buckle for fastening, and a metal ring for attaching a leash.