I suggest using a weight of 0.9.

Activation word is ougioshino.

This Lora was a bit different, her eyes and general character design is very peculiar, so I was worried it would've been harded, but after a few tries, I managed to get a result I'm happy with.
It works pretty well, I didn't really find big issues, except for the fact that a lot of tags are needed for the female school uniform to come out right, but I guess that's a very minor thing.
I went for female prompts in both the outfits for semplicity and to avoid confusion, sorry, I assumed Ougi's gender.
Also she's often depicted in fanart and official promotional art wearing black dresses, but there's not an "official" character design with a dress, so I just added a few images to help with training and it should be able to produce pretty much any common dress you prompt for.

Enjoy!

Prompts:

Female school uniform:

Sorry, I know, this one is very long.
In theory sleeves past wrists shouldn't be necessary, so you can try to remove it, but I found it helps with consistency.

ougioshino, short hair, bangs, black hair, hair between eyes, black eyes, bob cut, pale skin, empty eyes, skirt, long sleeves, school uniform, pantyhose, pleated skirt, necktie, shoes, puffy sleeves, black skirt, sleeves past wrists, black pantyhose, turtleneck, bob cut, juliet sleeves, brown loafers, black necktie, sleeves past fingers, pink shirt, naoetsu high school uniform, black undershirt

Male school uniform:

ougioshino, short hair, bangs, black hair, hair between eyes, black eyes, bob cut, pale skin, empty eyes, gloves, long sleeves, shoes, black gloves, black jacket, buttons, black pants, gakuran