have you ever had need of these items?

me - no but asos just recommended them to me leading me to wonder if I have made a dress error

a grave dress error

https://www.asos.com/asos-design/asos-design-stick-on-re-usable-nipple-covers/prd/7322150?CTAref=Complete%20the%20Look%20Carousel_2&featureref1=complete%20the%20look

They work (apparently).  Tit tape a better bet if you're worried about things moving around.  All those daisies do is stop your nips being revealed - it doesn't stop them escaping.  Unless it's erect nipples you're worried about, in which case buy them.  Just add a dab of Vaseline to the centre is you're worried about dessication.