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I think these pictures pretty much prove that the trenchcoat is a classic. And worth investing in. While I'm not ready to invest in a trenchcoat from Burberry or A.P.C. yet, mine from Zara's kidsdepartment will do for now.
Ps. Thank you all for the kind birthday wishes! The Harry Potter marathon was tough but awesome and quite sad too.
EDIT: After trying the Zara coat on for the 100th time I decided to return it. I'm not fully satisfied with the fit. It has kind of an a-line shape and the back's pleated. I guess I'd better start saving up then!