So, in the first picture it’s Ginny with her double and in the second it’s JMo with the double in the new pictures from the set… Also the double is not “pregnant” so I guess Snow not supposed to be ever… every second that passes I more and more support the idea of indyourhelm that Emma and Hook go back in time to meet Snow and Charming on the day they have met. It could totally explain the outfits. My guess is that Emma is sent to bond with Snow, and therefore dressed as a simple girl like Regina did once and gain just that, and Hook is sent to bond with Charming, and therefore got to lose the pirate look.
WAAAAAIT….HOLD UP….this would fit with the season description ABC put out that said “Hook now must enlist Emma in an epic struggle that spans worlds: with the highest stakes possible—the fate of her family.”
AND ONE MORE THING!!! Remember that spoiler from 3x21 about rumple, hook and emma filming together and they said rumple was doing something “Magical” ?! What if Rumple restored Hook’s hand so it didn’t cause alarm when he went to bond w/Charming and he put them in those outfits like he did with Charming when he went to find Snow and then he sent them back!!
I wonder if what happens in Once Upon in a Time in Wonderland is the reason that the laws of magic can be broken and that’s why time/the past can be changed this time. And that’s why the Knave will be in OUAT’s season 4, because he’s partly responsible for this and he wants to fix things.