Final answer:
Sarah's dad asks her if she knows what to wear to ensure she is appropriately dressed for the occasion. He wants her to feel comfortable and confident in her clothing choices.
Step-by-step explanation:
Sarah's dad asks her whether she knows what to wear because he wants to make sure she is appropriately dressed for the occasion or event they are attending. By asking her this question, he is showing concern for her outfit choice and wants to ensure that she feels comfortable and confident in her clothing.
For example, if they are going to a formal dinner, her dad might ask her if she knows what to wear to make sure she dresses in a way that is suitable for the occasion. On the other hand, if they are going to a casual gathering, he might ask her if she knows what to wear to make sure she dresses comfortably and appropriately for a more relaxed environment.
This question from Sarah's dad indicates that he values proper attire and wants Sarah to make knowledgeable choices when it comes to dressing for different situations.