As a very fit, young appearing 60 year old I look better without a shirt on than 90% of the guys over 30 years old, yet I keep a shirt on while mowing outdoors. If people have no pride in looking decent they are free to be grossly fat, covered with tatoos, have waist length filthy hair, clothing that looks it was recused from a dumpster, etc. okay for them. Just keep on mind I and other people are going to base our opinions of you based on how you appear. They say looks are only a first impression, but remember, you never get a second chance to make one.
It disgusts me what slobs a large part of the population seem to be these days. My wife and I dined out at a mid-priced steak house last week, and the majority of the people we saw there were wearing shorts, T-shirts, BATHING SUITS, ragged cut offs, garish colors, etc. I look more presentable than people like them do while washing my car. When people choose to look like slobs in public, it pretty much tells others how the slobbos feel about themselves. Poor appearance indicates a poor self image.