Fabulously Retro 70s Dagger Collar Long Sleeved Shirt. 
Made in Singapore for " K-Mart". Permanent Press. 
In excellent/very good vintage condition. 
Dark Brown Polyester with yellow, white, beige stripe detail 
Front breast pocket, double button cuffs. 
Labelled as Medium-15.5" collar
Measurements laid flat:
Pit to Pit: 20.5"
Waist: Almost 19"
Length from collar: 26.5"