I am notorious for forgetting what I want to make for myself costume-wise, because my list is so huge. Also, I never get anything done. Also, there is usually at least one costume on it that makes no sense and ends up getting scrapped really quickly (yes, at one point I had convinced myself that I would be Mimi from RENT for Halloween).
In progress:
Want:
The Archery dress from Narnia:
Doable? Yes, without the embroidery and stuff
Where would you wear it? King Richard's, I guess
Claudia's ballgown from Interview with the Vampire:
Doable? Er...
Where would you wear it? Er...um....er.
Katrina's stripey dress from Sleepy Hollow:
Doable? Yes
Where would you wear it? Creeping around in the woods?
Giselle's curtain dress from Enchanted:
Doable? Yes
Where would you wear it? Everywhere
(Okay, this I could actually make in a reasonably short amount of time)