Runs way too small, too loose rubber

I usually wear clothes size 42, I looked at the Trainigshose ordered separately a larger number (44), because I would have liked to have had more to them eg oä a leggings draw times over it. When the pants arrived, she was unfortunately super tight (even without what underneath), also actually too short. Therefore, I have sent back - Porto you have to pay yourself - and ordered a size larger (46). This is a bit further, but not much longer (1.72 am).
The rubber on the collar is too loose, tying without the band did not keep his pants unfortunately. Since it is also cut back relatively deep she slips when you sit down on the half-ass ...
Maybe I just figure the bottle, but I would not buy my pants again.