where for art thou, perfect blazer?

I have been looking for a blazer for years, and that's not even an exaggeration. I just want a simple, plain, black blazer that looks better undone that needing to be done up. is that so hard to find? Yes. I try on every blazer I see, and they are just not the ones. I want a blazer to wear with everything; dresses, trousers, jeans, leggings. I'm looking for something that fits like this

 

 

 

so it can obviously be found. all these lucky ladies found theirs! am I just the wrong shape?! I will not give up my search, so watch this space.