Mandals - okay if you wear them culturally, though I have never worn them. They just weren't worn much where I grew up.
Murses - only OK if they are actually, technically messenger bags, briefcases, or laptop bags and you are simply using the shoulder strap in lieu of the handle- use discretion and make sure it's masculine.
Mantyhose - only OK if you are in France or England AND it's the 17th century, which it's not, so it's never OK.
Mankinis - never, ever, EVER OK, even if you weigh 400 pounds and could pass for having a proper brookie.
Best,
Hill