Here is another one for you. The Red Stripes on his pants- They are Blood stripes he earned while in service with Imperial Navy. It was the only military decoration left after he was court martialed and dishonorably discharged by the Empire. It was a traditional uniform award, not a Galatic Military award. It was mentioned that he recieved his blood stripes for an event against wookies - so that might lay the groundwork for why Han was so willing to rescue Chewie - almost to make amends for something. Pretty much the same idea as the Blood Stripe on US Marine Corps Class A uniforms.