Usability and the mods required to perform said tasks.... That is sorta hard to nail down an answer for without seeing what you are doing. Nigel
Its hard to say without knowing more details (exactly what apparel you sell, target market, site...etc). Generally speaking it could be a killer photo, stunning call to action, usability, simplicity. On a side note (but relevant) we increased our conversions considerably for a higher end ladies fashion apparel shop, while removing all cross-selling and up-selling features/options. You could test this too.
There is no one size for all and no same gum to chew every time. Just for the sake of answer, most successful apparel sites have engaging design, detailed product displays, intelligent promotional deals, updated product catalog, social profiling and consistent customer support service. Rest is jargon!
For apparel you need lots of pictures and lots of details on the model wearing the picture. Think of a video as well. see asos .com
I can tell you what I do, but I have yet to find a single platform that supports it - had to code it custom every time. Post-checkout upsells. Normally your upsells and related items are shown either on the product page, or on the view cart page. This can lead to an increase in sales, but surprisingly it can also lead to cart abandonment. Putting the upsells at the END of the checkout process - after you already got their money - leads to much higher order totals. There's a psychology behind it. Lets say you visit a site, intending to spend $100. But while you're there, on the view cart page you see a couple other items you might like too... you add, and now suddenly your order total is $170. Maybe you're OK with that, maybe you aren't, but you're outside your range and a lot of people will back off at that point. But if you move them to the end ... take their $100 and finalize the order, then pop up a "Would you like to add X to your order for just $Y" with a simple Yes or No button and something interesting happens: their brain has reset from the impact of the original purchase. If the first upsell is $20, they aren't thinking of the $100 they just spent or the $120 order total - they are seeing $20 with a Yes or No button. It's a lot easier to get them to click Yes to add $20 to a completed order, than to get them to pay $120 at checkout.
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