Determine who is buying your product. Look at your order history. Ensure your advertising is reaching the right people. Track your funnel metrics (click-through rates, conversion rates) to identify problems. Make sure your website and ads align. For clothing, replicate the in-store shopping experience online. If you’d like to see our full answer, check out the stream recording which we have uploaded to YouTube. We start answering your question at around 01;02;24