1. Yes, we did have uniforms
They're nowhere near as glamorous as some movies make them seem. Uniforms skirts had to be a specific length and socks had to cover ankles. You could also only wear certain types of shoes for normal dress (usually Sperry's) and for PE class (had to be specifically athletic shoes). Pros are never having to worry about what you'll wear the next day. Cons are that cold days are brutal and sweatpants days don't exist. Another con is that dress code with uniforms are very strict. I was actually given a dress violation because my socks showed my ankles (oh, how I wish I was joking).
2. You got to go to church twice a week instead of once
One day a week, you get to go with your entire school. On Sundays, you get to go with your family. It was sometimes annoying but isn't really a big deal.
3. Some schools actually have nuns
Mine in particular only had one and she ended up retiring shortly after I went to high school. She typically wasn't in full nun attire, but exclusively wore fashionable thigh length jean skirts.
4. We had regulations
Along with uniforms, there were other specific things we could not do. We were not allowed any sort of makeup or nail polish. We weren't allowed more than 1 ear piercing at a time (facial piercings were a huge no). Earrings had to be studs, absolutely no hoops. Jewelry was limited as well. You could only wear necklaces with a religious symbol or bracelets that were gold or silver. We also weren't allowed to dye our hair in any way, including highlights.
5. Morning prayer
Every morning, we had to stand for the Pledge of Allegiance and pray. You didn't get a say in whether you wanted to do it or not. If you tried to speak out against doing it, well, have fun in the office.
6. School dances were intensely monitored
You didn't have to wear a uniform for school dances ( whew! ) but there was a dress code. Skirts and shorts had to be fingertip length and shoulders could not show. Music was always the clean version of popular songs and they couldn't have any hidden sexual or drug references. Teachers had hawk eyes on those who chose to dance. Boys and girls who tried to slow dance together had a teacher nearby at all times.
7. You meet lifelong friends here
Catholic schools typically aren't packed to the brim. I personally only had 42 students total in my grade, so you tend to know everyone fairly well. Plus, you have something big in common: your love for God.
8. No cell phones
Cell phones were collected at the beginning of the day from your homeroom teacher. Because the classes are so small, there's no way you can hide that thing to text someone. Besides, the only people you'd text are in the same room as you.