appearance

A black hen lays a white egg.

meaning

All are not hunters that blow the horn.

used to say that

All that glitters is not gold.

means that

Appearances are deceitful.

suggests that

You cannot judge a tree by its bark.

means that

Good clothes open all doors.

assumes that

Speak of the devil and he will appear.

is used for

A monkey in silk is a monkey no less

said to mean that

Clothes do not make the man.

suggests that

Don’t judge a book by its cover.

declares that

A blind man's wife needs no paint.

it is used

You can't tell a book by its cover.

suggests that

There is many a good cock come out of a tattered bag.

meaning that

What you see is what you get

said