Since your tag is princess panties...surely you've got some in your drawer, right?
My favorites are Cinderella and Elsa. So one day lets have you wear Cinderella, then the next day wear Elsa!
But if either of those pretty girls aren't in your underwear drawer, the fun begins :3
If you don't have Cinderella underwear...
Spoiler:
Oh no, princess girl lost her panties! Take a pair of your plainer panties and leave them somewhere, as public as you dare. Outside your house, in a restroom stall, etc. Leave them there, then go about your day, then come back to pick them up on your way home. Hope they're still there, Pantyrella!
And if you don't have some cute Elsa panties...
Spoiler:
Well, at least we can make you feel like Elsa! Let's dump a handful of ice down your panties! They're gonna have to stay in there until they melt, but that's ok, the cold never bothered you anyway, right?