This is the 14118th most frequent German word.
gesehene
"Seen" (past participle of "sehen," meaning "to see").
Here, 'gesehene' is used as a participle form referring to the completed action of seeing in the past.
Das ist der Film, den ich letztens gesehene habe.
That is the movie that I watched recently.
In this sentence, 'gesehene' is acting as an attributive participle modifying 'Mode', indicating the fashion that is observed frequently.
Die oft gesehene Mode in dieser Stadt ist wirklich beeindruckend.
The often-seen fashion in this city is truly impressive.
'Gesehene' is again used as a participle relating to the observation action that was completed in relation to 'Bild'.