My strategy is to play two or three bets with small bets,if I win something hen I believe I am lucky today so I will continue few more bets and sometimes it helps too.
I think this is a usual stuff, except for the color of shirt. In our country, we don't really believe in this type of beliefs in gambling. If that will be a superstition about something other than gambling, people will be believing it. In my experience, if you are not lucky today, you can just come back tomorrow and try again though it proves that being persistent do not always lead to a good or positive result.