Stuffy or hot depends on two things: Who's stuffed in it and what kind of a uniform? A hot woman is made even hotter in a hot uniform. A not-hot uniform on a hot woman will detract from or mask her hotness. A not-hot woman in a hot uniform boosts her overall hotness, while naturally, a not-hot woman in a not-hot uniform only makes things... really not hot.
 
Let's start with hot uniforms:  Usually crisp and authoritative work best: cops, military gear, high powered Citibank worker, stewardess, pilot, dental hygienist, nurses and anesthesiologists do the trick. We like this because these outfits translate to power and authority; many guys enjoy a fantasy that plays and twists the idea of control. Who amongst us doesn't want to be handcuffed to our car by a foxy chick, reeking of coffee and dressed to the nines like a State Trooper. "You know how fast you were driving, young man? Drop and gimme 20."
 
Furthermore, men like the power-uniform because it presents a challenge. The guy thinks, "I'm gonna take that fancy, strict lady and turn her into my very own purring kitty cat." Now, I will admit I just felt gross writing that, BUT it doesn't mean it's not true. The uniform itself creates a built in story that plays upon domination/submission and the erotic tales of give and take.
 
Lastly, in brief, some not-hot uniforms; Professional attire that doesn't (ON ITS OWN MERIT) ignite the hornies:

1.       Grocery store bagger
2.       Dog walker
3.       Moishe's Moving Truck worker
4.       Hot dog seller at Yankee Stadium
5.       Parks and Recreation get up
6.       Walmart homeware staff
7.       Phishfans
8.       Lunch lady
9.       Verizon ma'am
10. Check-out girl at Panera Bread