DGD wears sticky things when she has a dress which reveals the back of a bra - seem to work on her OK but she is very slim - mid 20s - she has shown me how they work but I can't remember now. She doesn't tend to wear strapless tops.
I sometimes find that even vest tops show bra straps as the line of the vest is incorrectly positioned for the straps.
Harry and Meghan ‘royal’ tour of Nigeria.
Static caravan purchase is it worth buying