She thinks just because you're related that your closet is her closet; and if she ever gives your things back, they're never washed. If it's time to stop your sister from being a closet bandit, check out this video. This tutorial is full of tips for gettinf rid of that pesky sibling and keeping your clothes all to yourself.
You Will Need
• Clothes to share
• Optional: Lock
Step 1: Ask her to stop
Ask your sister to stop taking your clothes without your permission. Remind her that she wouldn't like it if you took her clothes.
Yelling, screaming, and hitting your sister is not an effective way of dealing with this problem.
Step 2: Enlist your parents
Enlist the help of your parents. Explain what is happening and ask for their help in getting your sister to understand that taking your things is wrong.
Step 3: Buy clothes to share
Designate certain clothes that you don't mind sharing and let borrow those. Make it clear that others are completely off limits.
Get a lock for your bedroom or closet door.
Step 4: Give her a consequence
Give her a consequence – every time she takes something of yours, you will take something of hers. Follow through every time.
Step 5: Be flattered
If all else fails, be flattered that she admires your style, but don't forget to remind her at every opportunity how obvious it is that she wants to be just like you.