This adorable jumper dress has a good balance of cute and retro styles.
ジャンスカコーデ (jansukakoude) means "coordinating jumper dress."
ジャンスカ (jansuka) or ジャンパースカート(jumper skirt) is a wasei-eigo of jumper dress.
コーデ is a slang word for coordinate / coordination.
A fashion trend suggestion.