I had a question online about a recent post so here are mine! A doily (also doiley, doilie, doyly, doyley) is a used for protecting tables from moisture. You will see paper ones used with cakes for presentation. To make a protective cover for a jug use any doilies. Simply sew a few buttons on the outside edge so when placed on top of the jug the buttons weigh the fabric down to protect the contents from flies and dust. Especially helpful when dining outside.
FYI A doily is decorative piece of fabric made by a London draper, Mr Doiley in the 17th-century. No Doilies? Use decorative handkerchiefs, small scarves and scraps of material.