What age group is this costume for?
Elementary School
Middle School
High School & Beyond

Estimated time required to make this costume:
30 minutes to an hour

Difficulty level:
Quick and easy - no sewing required

Items you will need: (Hit your return key to start a new line)
Outfit from your sister
Makeup
Some of her nail polish
Some of her shoes (or some like them if they don't fit)
Wig of her hair color

Instructions:
Get an outfit from your sister. Put it on and have her put on makeup like she would put it on. Have her paint your nails. Put on the wig and shoes and your set.

Other information to consider:
Maybe she should work with you before you go so you can pick up on how she walks, talks, sits, etc.