S3's can physically accommodate skinny people of different heights, (removable steering wheel, lowered floors etc) but girth and shoe size become a problem very quick.
Girth can be helped with leather seats but steering setup and pedals can't really be helped much. Plus leather seat width has a certain limit as well.
There are many people I can't even take as passengers in my S3 with Tillets because there's just no way they will fit if they are at all "americanized", but height is usually not a problem for a passenger.