Click on the dress if you want to change the colour. Sometimes you might have to double or triple-click. Sorry about that. Click and drag the lace, flower ribbon, butterfly or sunflower. Just drag the belt. When you are done, press the checkmark. The items discluding the belt may be a little hard to click and drag.
Please do not change the code if you look inside. Let me know in the comments if something is wrong. Thank you! :)