The calendars in Dinah's world and Milliways have once again become roughly aligned - but that doesn't mean she's particularly aware that Hallowe'en is on its way, because this time, she's not exposed to the massive marketing that hits the streets in Gotham. In Japan, they have the festival of friendly ghosts, which she's looking forward to participating in, but she hasn't put any thought into costume.
Cue surprise, therefore, when she enters Milliways and feels her
clothing change - and for change, read 'mostly disappears'. Not that this is usually a problem for Dinah.
The 'problem' that grabs her attention at this point is the shuriken that's appeared in her hand. That won't come off when she shakes it.
"Oh come on," she tells anything that might be listening that has dictated this outfit, "I don't even use weaponry."
She hasn't even noticed her hair yet.