Women nudging their bra straps back under their clothes is not a very uncommon sight.

While clear straps are clearly visible, safety pins are maddening. Also, devices that pull your straps together, between your shoulder blades, are very uncomfortable and awkward.
Strap Tamers are a new product that hold your bra straps in place and are so easy and effective to use.
Strap Tamers, made of highly durable plastic consist of a clip (to hold the bra strap) and pin which is fastened to the inside shoulder seam of a garment.
Try them for yourself