List complex sorting

by

Create an array of sizes in the order you want them to be in, then sort the shirts by the position of their sizes in that array:

string[] sizes = new [] {"XS", "S", "M", "L", "XL", "XXL", "UK 10", "UK 12"};

var shirtsInOrder = shirts
                        .OrderBy(s=>sizes.Contains(s) ? "0" : "1")  // put unmatched sizes at the end
                        .ThenBy(s=>Array.IndexOf(sizes,s))  // sort matches by size
                        .ThenBy(s=>s); // sort rest A-Z

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