I think it looks quite good.

Maybe use a hairnet and put it in a tighter bun, if you worry about it being wavy.

That looks fine!

If you're worried about the waviness of your hair:
You got a hair straightener? Or even a blow-drier? Use a little moisturising serum in your hair while it's damp (to protect from heat damage and avoid frizzing), and then use a hair straightener on med-low heat, or brush your hair continuously under gentle heat from a blow-drier, to get most of the kinks out.

Thanks for the replies!
I was worried about the wavy hair because in the video, her hair is curly, and I was wondering if the hairstyle would work if your hair isn't curly/stretched like hers.