Drove myself crazy posing this one. The chair comes with poses for the model to sit in it, so I figured "This should be easy!". Duh! It puts her in the chair, but the leg supports aren't aligned to begin with (I think they are just in a "default" position and size to start with regardless of what pose is used). Each chair leg support can be translated and rotated through the 3 XYZ axis's and also can be sized in the 3 XYZ axis's to fit the model's leg size. I spent an hour moving things around and wanted to beat my head against the wall before I got done. Each time I lined one axis up it screwed up the other two axis's. And created collisions and bleed throughs of the legs and supports. I finally got it "close enough" without strapping the straps down tight. If she gets out of it, so be it.
PS - When I finally got the legs/supports aligned, I was so worn out I missed the fact her ponytail was stuck into the backrest before rendering it. Duh Two!!