What everyone is saying is: you don't use a lav out doors. All of their reasons are correct. A lav WILL pick up sounds from across the street. Use a boom or hand held for talent. You can wear one - but you will pick up your jacket, a hand or other parts of clothing. I do a ton of ENG for news show and the worst thing you want to do is bring back bad, unusable audio with a great clip. ;)