Question: To prevent a bra strap from being visible on accident,
Options:
super glue the bra strap to the inside of whichever shirt you want to wear that day to prevent the bra from moving.
create a small strap of fabric with a button and sew it into your shirt to wrap around and conceal the bra strap.
Answer: create a small strap of fabric with a button and sew it into your shirt to wrap around and conceal the bra strap.