I wear an Aerostich Darien 2 piece, but only when I'm riding supermotos or adventure bikes. It looks ghey on anything else. I crashed it about a week after I got it when I tucked the front end of my had-it-a-week-too / most-expensive-bike-I-ever-bought KTM 950 SM on some dusty 28 degree F pavement. The clown in front of me looked up from his Blackberry, saw the (on for the last 1/2 mile) brake lights on the asshat in front of him and matted the brake pedal, right as I was on top of the huge crown in the pavement in a city intersection. Clown.
Anyway, the Darien works as advertised. I hit remarkably hard for 20 mph, got up, rode back home and swapped the bent KTM for the DRZ400SM and rode to work.
Crashworthyness is in large part determined by how you feel a day, then 2 then 3 after you crash in a garment. The 'Stich had me feeling pretty good, and it is un-marked aside from a little spot where the flap over the side-leg zipper near the knee ground through.
When I had to dress sort of like a grownup for work the Darien was nice 'cause I could step out of it at my desk, swap the motocross boots for some Italian loafers and I was ready to "work"