White Mountaineering makes/made something similar.
Quite a lot of designers have been starting to do more relaxed top block tapered pants lately, at least it seems so to me. Shouldn't be too hard to find. Elasticated waists are also kind of popular right now. Dries, Geller, Ute, Schneider, COS, KVA, Zam B, Forme (and basically all other SZ brands), Damir, Peir Wu, Petrov, all have some kind of version out this season.
Nothing on sale atm though.
Yeah, I've been meaning to try the majority of those designers (Damir/Silent especially) so I guess I'll just keep an eye out on B&S/Y!JP.
I got these pants from COS recently, yet to arrive but they look like they'll work nicely.