all fur and no knickers

all fur coat and no knickers

Having a superficially positive appearance that is belied by the reality, e.g., superficially elegant and beautiful but actually common.

get one's knickers in a knot

Synonym of get one's knickers in a twist.

get one's knickers in a twist

To become overwrought or unnecessarily upset over a trivial matter.

keep one's knickers on

To stay calm; to not get flustered or angry.