question...

Jackie, i like your idea too... and it wouldnt be too far fetched since i've done that before, expect in the reverse. i would come in sweats and always bring something cute in case we ended up going there..

uuummm any kind of tracksuit - juicy or not - please dont wear kitten heels!!!  reminds me of... nevermind - just dont do it =)

ditto neebs - something that is cute - but not trying too hard???

I second d1rty, negative on the kitten heels with a track suit.  Besides, I think youre going to be too hot in a track suit, no?

What about a cute little jean skirt and a babydoll top and strappy sandles? You'll look casual so as not to give off the impression you knew about the party, but you'll still look really cute!

I would wear a cute outfit, but bring sweats and tell her that you were out or something, and planned to change

conveniently have an "errand" prior to which you have to wear something other than "clean up clothes". tell her you'll be coming from the florist or something and will change at her house. if its a hot day it'll be a perfect reason to wear a sundress and cute sandals!

I second WMforever's idea...its exactly what I was thinking! 

the problem is, i cant wear heels ( i am supposed to be cleaning, lol) !!! what im thinking of... is to take a cute dress with me, come in sweats and as soon as everyone yells surprise.. i'll be like... brb!!!

and go change.

i can pretend to go shopping before i come to my moms house.. and then bring up a dress and a shoes to show off to my mom... be like.. mom, what do you think of this outfit? i just bought it... can i try it on for you?

haha.. i dont know!!1 i wanna look cute!

i like mare's idea.  that way you can already have your face on and a cute outfit.  i think wearing sweats and bringing the dress and shoes forces you to lie a bit more and might be a bit more suspicious...kwim?