Absolutely, your ability to specify specific colors for your designs is a standard practice when working with clothing manufacturers. Providing Pantone color codes, color swatches, or detailed descriptions helps ensure that the manufacturer understands and reproduces the exact colors you envision.
It’s important to note that, as you mentioned, custom colors may come with a higher minimum order quantity (MOQ). This higher MOQ is often necessary to make the dyeing process efficient and cost-effective for the manufacturer.