I mean what do we even say a gyaru looks like fr. Like is it the hair or what they wear. Like Japan say everyone a gyaru fr when they aren't even the teacher isn't one since she wearing modest clothes and only has dyed hair or it could be natural for all we know
Seduction is important but if you make your intent clear to the other person, you r just acting like a slut/easy girl with showing your cleavage like that in the classroom.