It's still possible to dress lightly and modestly.
If you want to wear shorts, fine, just don't make them so short that you have to powder another set of cheeks, and so tight that your thong underwear is showing (Sadly seen both in church).
Nor is there any need to wear a top you have to keep yanking up cause it's falling off or you keep popping out of.
I’m guessing it was a sleeveless top which to me in Church is appropriate.