Develop Custom Shirt Configurator for Squarespace Website

Seeking an experienced web developer to create a custom shirt configurator for my Squarespace site. The tool should allow customers to customize shirts, hoodies, and long sleeve shirts, view mockups in real-time, and submit their designs in multiple colors and sizes. The form should also automatically email me the submitted designs for approval. Inspiration can be taken from sites like Rush Order Tees or Custom Ink.