The first implies that it is the T-shirt that makes her look beautiful. The second makes the point that the girl is naturally beautiful and that she just happens to be wearing a blue T-shirt. There was a time where I wanted to buy a shirt… The shirt wasn’t expensive, it was about 5 dollars… I didn’t have money right then and there, told the guy at the shop to wait and that I’ll be back soon since I forgot my wallet. I went to my grandmother, across the street, asked her to come with me and that I wanted to buy a beautiful shirt… She agreed! YAY! Went to the shop again, gave the guy the 5 dollars, and waited for him to pack my shirt. Let us consider a house full of males walking around without a shirt. In our modern view, we see it as normal. The man with excess fat covers himself not to shown excess skin or fat. Among them, a young girl walking topless will not cause any issue. Not long ago, in my lifetime, I have seen many elder women topless and doing their work in hot humid places and no one said a thing. The young ones too were topless in their restricted environment.