More importantly, it is the date after which, you may not CHANGE your Purim costume.
But now it’s (almost!) Tu b’Shvat, and if you want to be a flower-selling girl, horsey or ninja, that’s completely FINE with me. Just decide, and stick with it… because you aren’t changing your mind after today!
(By the way, YES, this rule applies even if I have made no actual visible effort towards purchasing or making a Purim costume. The creative process is complex and meandering, and should not be interrupted at any time!!!)
(Here’s me and my sister Sara last Purim! Catwoman vs Angelic-Woman)
And from the Archives!
I think this was Ted’s very first Purim with our family… I’m dressed as the Kohein Gadol, my favourite costume of all time. The big kids were a pirate and Queen Esther (her choice – I would never, ever, EVER make a kid dress up as someone from the Purim story, which was the rule when I was growing up… because, of course, we could dress as whatever we wanted for Hallowe’en!!!)