Is it legal for a male to wear dress outside or in car?

Perfectly legal.

Wow, unless your in one of those places that has some obscure, off-beat, malformed opinion that somehow crossdressing will bring about anarchy, plague and disease, dogs and cats living together, mass hysteria, then what does "legal" have to do with it. Are you impliying that if something is not codified as "legal" that it must by default be "illegal"?

Mate, it's been practiced for centuries around the world, even your own scots wear kilts (oh right, those are man-skirts). Society is a mad-cow when it comes to defining what is "normal" and what isn't

There is no law stating what anyone should wear, only that a person is decently covered. Have you ever heard of anyone going to jail for wearing a dress?

He can wear a Dior evening gown and a tiara if he wants.

Of course it is. Don't be silly. A man's allowed to walk down the street in a gorilla suit, swinging a bunch of bananas above his head as he goes.

That's not to say an onlooker/cop wont beat them up for it however, in either case.

Maybe it's legal... but don't try it in Glasgow on a Saturday night.... not if you want to live until Monday.

Yes it is legal

You can wear whatever you like in the UK provided it covers the obvious...

US, UK, European countries, Canada, Australia, NZ, Newfoundland, many others have no laws against it.

If its good enough for the pope, it's good enough for the rest of us.

No, it is illegal. You will go to jail. I have alerted the authorities as to your query and they are waiting outside your house to arrest you.