Shock Collar Question – June 18

Brooke is wearing the Shock Collar this morning!

Today's question: In 1904 the Cooper Menswear company ran a magazine ad for a piece of clothing designed exclusively for bachelors. The ad was aimed at men with no sewing skills and no wives to alter their clothing for them. Soon a member of the US Armed Forces got a hold of the ad and it wasn’t long before he and all of his battalion started wearing this item to keep cool. Today it’s worn by billions of people every single day. What piece of clothing am I talking about?