Answer:
You can do three things. (1) Either buy in the gift shop (if they're selling normal clothes,) (you have to be a member to buy them though.) (2) Or you can buy something in real life, from a toy store, that involves Club penguin. This item will most probably contain a code. Go on to Club penguin and click on 'I have a code.' Then follow the instructions and type in your code. You can then pick the free item that you want. (3) is to buy a book about Club penguin. Go on to Club penguin, then, click on 'I have a book.' Follow the instructions and answer the question. Again, you have to pick your free item. (In this case, yellow hair!)
I hope this answer is accurate and correct. Thank you for all your time and effort!