The Shopify theme "Dawn" has a "Related Products" section that dynamically suggests products, but there is a similar block called "Accessory Products." This allows you to intentionally specify the products to be displayed, so it's a good idea to display coordinating products.
Link to other products using the "Accessories" block that can be added to the product detail page of the "Dawn" theme
[Setup Method 1] Add the "Accessories" block to the "Product Information" section of the product information template in the Theme Editor
[Setting Method 2] Install the "Search & Discovery" app, open the "Recommended" menu, and set "Accessories" for each product you want to feature.
