Thanks, everyone!
So, I'm going to keep the denim jacket - surprise, surprise!
And I'm definitely still feeling ambivalent about the red jacket. I accept the color, I think that's okay and like you all said the red doesn't overwhelm me. But I'm still undecided about the fit. On the one hand does the jacket look pretty good when it's open, on the other hand is the creasing when it's closed up. I know that I probably wouldn't find a better fitting jacket, but I think that the pulling would bug me if I would wear it closed (like CocoLion said). But it would definitely not be an everyday jacket, anyway. I like what ellie said, about only keeping something which fits 100%. But on the other hand I don't think there's a 100% blazer out there which I can afford. I'm also unsure about the fabric. It's synthetic and fairly warm. So not a summer blazer, but more a spring one. But a blazer for colder weather I can't button up? Mmh. The blazer wasn't expensive, even for H&M, so I thought I should keep the jacket anyway. But after writing this I'm unsure again.
ellie, the skirt is actually two or three years old and a no name brand. It's a simple summer cotton skirt and I think I got it in some grocery store that sells clothing, too. Like in Aldi or Lidl?
Una, these are puffy sleeves, yes. I never wore puffy sleeves before!