Only pack the clothes that you are planning to wear.
This is from Manhattan SC 2003 ed and it is the correct form.
I think the correct answer should be -
Only pack those
clothes that you are planning to wear.
Want to improve your CR: cr-methods-an-approach-to-find-the-best-answers-93146.html
Tricky Quant problems: 50-tricky-questions-92834.html
Important Grammer Fundamentals: key-fundamentals-of-grammer-our-crucial-learnings-on-sc-93659.html