Yes, who does not love customizing products as per their tastes and preferences in the online website. When a customer designed a product that they use like a t-shirt, coffee mugs, jerseys, caps, shoes, greeting cards, business cards, etc i.e the product suits their way.
Therefore, when a customer is happy shopping, then you are happily growing your sales. Therefore, Online store + product designing = Customer satisfaction. Furthermore, it enhances trust which gets in more customers both new and old.