Cold
Since Brexit you have to pay customs duties on anything you import from the EU and the EU countries have to pay duties on stuff they import from the UK.
Your purchase is usually held up until the amount is paid. Some companies arrange for the customs duty to be paid in advance when you purchase (M&S, Amazon etc) but probably not a small Etsy shop
I bought some fabric last year that was despatched from Germany - the enclosed paperwork, one sheet of A4 per cut length of cloth, stated that NO customs duty was payable. I did keep the paperwork as it included the cost off the fabric and I presented copies to my customers once their garments were ready for collection.