If you are running a clothing store using Shopify, then common and most important app that you will try to find will be a color swatch app. Although every cloth has different color options that you want to show on your site but in shopify, there is no such app which can serve the purpose accurately. Some alternatives are there but a good option is not available.
We have coded a solution for this and thats a custom solution. Please contact us by contact form here if you want that to be applied to your site.