video1.0<iframe src="https://www.loom.com/embed/33de7e74fa8e4b51aab97b0d44159b57" frameborder="0" width="1728" height="1296" webkitallowfullscreen mozallowfullscreen allowfullscreen></iframe>12961728Loomhttps://www.loom.com12961728https://cdn.loom.com/sessions/thumbnails/33de7e74fa8e4b51aab97b0d44159b57-55cdd97e5491ade4.gif460.675Use prior-year Shopify unit sales by month to identify the best-performing t-shirt, then remake a variation for the same month the following year. Color variety across months is required, and every planned design needs a backup ready to swap if early sales are weak.