Your initiative in addressing VAT concerns for your online POD T-shirt business is commendable. Operating internationally with Printful and Squarespace adds complexity, but seeking guidance early on is key.
Considering the intricacies of VAT regulations across EU countries, consulting with an independent force in global and UK VAT would provide valuable insights. Their expertise can help you tailor your approach, ensuring compliance and smooth transactions for your European customers. Don't hesitate to reach out for assistance, and I wish you continued success in your business journey!