I'd recomend waiting till your stuff showes up to take that ride....
+1. I haven't ridden around a block without full gear in three years, much less all day.
If you're doing highway, you'll be surprised how comfortable you can still be in seemingly ridiculously thick materials with windflow. Better protection and less prone to flapping in the wind. Ideally a wicking t-shirt, a thin woven shirt and a hearty denim jacket. If you sweat, it helps the cooling but you need to keep hydrated.
Jeans are not really protective, but a start. Those crazy Carhartt canvas pants or some nutty brushguard hunting pant would be better (for abrasion, impact not so much). But if you have the dough and time, I'd swing by a Cycle Gear or something for some cheap but fairly effective gear.
