I think I would chalk up the appearance of the hood to the combination of helmet straps & Han's moppy haircut. As for the moustache, Harrison Ford has some pretty pronounced upper lip area, that might appear like a moustache when top lit like in that shot...
Guys, it's a pretty simple explanation...
Step 1: Han "Wait! I've got an idea."
Step 2: Han Solo wearing a helmet and gloves, and not showing anything else "It's over commander...blah, blah, blah..."
Step 3: Han Solo surprising the reinforcement troops with a grin and shoulder shrug.
If it looks
like Han Solo, sounds
like Han Solo, ends
with Han Solo and was Han Solo's idea, then it's Han Solo.