There are some distinctly regional hairstyles and trends that are found in one region, but very rare in other regions. Here are a few I can think of for men.
Southern Preppy Style.
Bama Bangs Hair Style with Swoop to the side
Khaki Shorts
Polo or Button Downed Shirts
Boat Shoes without Socks
Southern Hip Hop Style
Grillzs on Teeth
Super Baggy Tshirts that goes down to Knee
Dreads(Especially in Florida)
Southern California Bros Style
Flatbill Caps
Bandanas
Sleeveless shirts
Dickies Shorts
Socks up to knee
Southern California Urban Style
Skinny Jeans
Black or White Tshirt with a statement
Tartan or other Striped Shirt
Vans or Chuck Taylors
Pacific Northwest Hipster Lumberjack
Flannel Shirt
Beard
Jeans
Stock Cap
Boots
Some Wear Thick Rimmed Glasses