Henley Flowers buttonholes are usually made with integrated pin fixings

(so that they can be put on like a badge).

For anyone wearing a delicate fabric, they can also be made on magnets.  Or for something a bit different, why not opt for a wrist corsage or handbag corsage.

See below for lots of examples: 

buttonholes and corsages

Can be made with silk/artificial flowers (as pictured here), not just using fresh flowers.

Henley Flowers