It isn’t just irony, it is absolutely BRILLIANT!!! Think about it.

Peter Pan and Captain Hook are the ultimate rivals. Captain Hook hates Peter’s lack of responsibility and ignorance, Peter hates Hook’s age, bitterness, and responsibilities.

Tinkerbell on the other hand loves Peter and is there constantly to support him and help in his battles.

Since Vriska was dressed a combo of Peter’s friend AND foe, add in a little lust to the mix, and you have her dressed as a prefect representation of her HEART/SPADE feelings to Tavros