Not necessarily, but it could be. Regina’s clothing does have a lot of floral motifs in dove grey and white especially in that outfit she wore when she was still an innocent young princess. It could be a flashback outfit to those younger days.
If she has a history with the WWW then sure could. Maybe they were friends as kids? And Regina went and married the king and WWW was jealous?
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"He was a lot of things to me" "The only conclusion was love"