Overcoat sizing/recommendations

tried this in a store to get a general idea of how a coat like it would fit on me. this was the only one that went even close to my knee, all the other ones were mid-thigh..

I'm looking to buy one second hand but would be happy for any pointers/recommendations. For context: I live in Germany, I want to buy a coat second-hand for less than 100€ and I'd be wearing it over tailored jackets paired with dress pants, chinos and cords. I think I want a coat that goes down to my knees, I'm not a fan of the "car coat" look, but that makes it difficult.
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