gild the lily

Fig. to add ornament or decoration to something that is pleasing in its original state; to attempt to improve something that is already fine the way it is. (Often refers to flattery or exaggeration.) Your house has lovely brickwork. Don't paint it. That would be gilding the lily. Oh, Sally. You're beautiful the way you are. You don't need makeup. You would be gilding the lily.

to spoil something by trying to improve or decorate it when it is already perfect Should I add a scarf to this jacket or would it be gilding the lily?

Add unnecessary adornment or supposed improvement. For example, Offering three different desserts after that elaborate meal would be gilding the lily. This expression is a condensation of Shakespeare's metaphor in King John (4:2): "To gild refined gold, to paint the lily ... is wasteful and ridiculous excess." [c. 1800]

Engage in an unnecessary and usually wasteful activity. Like carrying coals to Newcastle, to gild a lily would be a waste of time as the flower already possesses more than sufficient beauty. The phrase comes from a misquotation of lines from Shakespeare's King John: Therefore, to be possess'd with double pomp, To guard a title that was rich before, To gild refined gold, to paint the lily . . . Is wasteful and ridiculous excess.