Head to the Great Hall

Best to start in the heart of Winterfell. The Great Hall.

It is empty when you arrive. Swept clear after the morning's meal by a legion of maids and attendants. In the hearth, an embering fire gently burns away. You begin to search the High Table and its surrounds. The table itself is crystal clean, the wood polished and damp from cleaning. The sill above the fire is bare, save for a few decorative ornaments - skulls from hunts, wildling trinkets and the like. A small jug of spiced wine, still warm, sits on one end of the table, but no other cutlery or plates sit. They are evidently still being cleaned from the morning's meal.

You search further, but it quickly becomes clear that the sewing kit isn't here.