to be dressed up to the nines = to look very smart
to be the height of fashion = to be very fashionable
Black is the height of fashion this season.
to be all the rage = to be very popular (old-fashioned)
Flared jeans were all the rage in the 90s.
a latest craze/fad = something that is fashionable for a short time
to be dressed in style = to look stylish
Getting dressed in style requires a great wardrobe with go-to pieces that can easily be mixed and matched.
to be happening = to look fashionable, trendy
He’s a real happening guy.
fancy shmancy = fashionable, impressive
Her fancy shmancy dress must have cost a fortune.
cheep and cheerful = “дешево и сердито”
to look posh = to look expensive and attractive
He looked posh. Smelt posh. Walked and talked posh. Even the way he was crouched behind the chimney was posh…
to dress with swag = to dress with style