Oh! So I must have gotten this advice from my MoM visa vie her grandfather--a man I am not sure I met at an old enough age to remember him.  Still it's sage advice.  This said, I'd recommend both hand out of the pockets if you're clumsy like I am.  I guess if you're sprightly, you might try one hand in the pocket and one hand out of the pocket but that seems risky to me!