Final answer:
The appropriate phrase to ask about clothing size is 'What size are you looking for?' It allows the customer to express their preferences and opens up further discussion.
Step-by-step explanation:
The appropriate phrase when discussing clothing size with a customer is 'What size are you looking for?' This phrase allows the customer to express their preferences and provides an opening for further discussion. It is important to avoid making assumptions or commenting on the customer's appearance, as this can be perceived as rude or insensitive.
For example, if a customer asks for a suggestion, a more appropriate response would be to offer guidance based on the brand's sizing or to recommend trying on different sizes to find a comfortable fit.