Hi, I am selling clothes. The size of most clothes are customizable as long as the customer enters some additional information like waist/bust/height and we will charge a fixed amount of fee on top of the standard price. So I want that on the product page, besides the standard sizes with standard price, there is also a custom size option. If the customer chooses the custom option, the product page will show the custom parameters like waist/bust/height which might be drop-lists for the customer to choose from. And price will be increased by adding the fixed fee.
Is it possible to do that without installing third-party apps?