Unfortunately spans the butt

Although I have the Göße S for Tops, my butt is unfortunately a little wide. Since then doing the following problem: Obenrum the parka fits perfectly and also looks very chic. Unfortunately, I get him in the size S only bad about my butt. Thus, he slips a bit high and it was then well with the good fit.
A great pity, in M ​​it is certainly my obenrum too big and thus I have kept for another model out.
Otherwise, however, there is nothing to complain about, nice parka, I can recommend.