The business in the store is not very prosperous, and the boss asked me to send text messages to new and old customers. What should I say?

Dear VIP customers of XX store. Our store's new clothes ~ pants ~ and so on in autumn and winter. If necessary, you can come to the store to buy, and we sincerely look forward to your visit.

In fact, most customers who have been to your store know your style. Just tell him that the goods have arrived. Don't make it too complicated.