Do you have a friend or family member who doesn't seem to look nice in whatever they wear? Dressing up someone else will be all the more fun when you share your clothes, make up and ideas.
Choose a nice t-shirt of yours that will fit the other person perfectly. If it looks to plain and boring - a cute necklace or scarf will spice things up! A short skirt with leggings always looks fabulous on anyone - but jeans look fab too!
Choose some nice shoes. If she wears trainers, can she wear your boots for the day? Or some pretty pumps or clogs will look fantastic!
Put on make up on for normal everyday wear, and on special occasions like Halloween, stage makeup will be good.
Add a nice handbag for the perfect accessory - a small one looks nice for the casual look.
Some make up - not too little or too much though looks sweet! Some nice coloured eyeshadow - some blusher and some lip gloss is good for enjoying a casual night on the town or going to work.
If her hair is always in a bun - curl it - straighten it or do something neat with it other than a bun! If you are at a preteen, tween or teen age take her to the hair salon to get some extensions or feathers.
Don't force the other person to do what you wish; this is a shared process.