Synonyms for In style:

adj.

•du jour (adjective)
stylish.
•fashionable (adjective)
in vogue, modish.
•prevailing (adjective)
fashionable.

n.

•in style (noun)
fashionable, in vogue, modish, stylish, a la mode.

Other synonyms:

•modish
modish.
•Other relevant words:
fashionable.