Herein, what are straps inside tops for?
For one thing, dress or top plastic straps serve a purpose. They are there to keep the clothing item on a hanger. Sometimes these straps are a clear rubbery material or a ribbon type material like in the photo below. I find these are usually there to keep the clothing on a hanger in the store.
Beside above, what are the ribbons inside shirts for? You know the ribbons I'm talking about. The ones that are sewn inside the shoulders of your tops, cardigans and jumpers, and in the waistband of skirts. They are meant to help your clothes stay on the hanger, and take the weight of the garment to save the fabric from stretching.
In this regard, what are the strings inside clothes for?
Those stringy belt loops on the sides of your dress are making it look cheap AF. Those loops are really there so that stores have a way to display the belt on the garment when it is on the hanger. Otherwise it would get lost or you might think it was a scarf or something. SOLUTION: Cut them off.
Is it OK to show bra straps?
Bra straps need not be hidden, they should be showcased and shown love; but that doesn't mean that every once in a while, you won't come across someone who just won't have it. They'll point it out, say something rude, and walk away as if it were no big deal.