Collocations for fashionable - adj.

be, look
become
remain
make sth
consider sth

extremely, highly, very
Furnishings of this sort are now highly fashionable.

increasingly
quite, rather
currently
newly
suddenly
a young and suddenly fashionable actor

no longer

among
These cars are no longer fashionable among the young.

Fashionable is used with these nouns:
accessory, clientele, clothes, resort, shoe