Hey there, @inneryouuk
Bo here from Shopify Support!
That is a really great question. In our theme store you can actually filter our collection of themes by industry, Clothing and Fashion being one of them:
After this you can further filter our themes by other requirements you may have from your theme such as the number of products, layout style and so on. Each store, even in the same industry can widely vary so I would recommend taking a look through some of these themes, trying them out and choosing from there.
Let me know how this goes and if there is anything else I can assist you with, I'm happy to help!
All the Best,