** I have gathered information on the top-selling items from various sources, including StockX. However, due to the limitations of my browsing tool, I wasn't able to directly access and analyze StockX's data on its best-selling items. Nonetheless, I found an article on StockX's blog that outlined some of the most popular fashion items sold on their platform in 2021. Here are the top-selling items based on that source: 1) Supreme Milan Box Logo Tee: This T-shirt was released exclusively at the Milan store's opening and features a graphic of Leonardo Da Vinci’s The Last Supper inside the Box Logo. Its limited availability and unique design make it highly sought-after, leading to high resale prices​ (1)​. 2) Yeezy x Gap Hoodie: This item has been the best-selling hoodie on StockX since its release in September 2021. It is available in six different colors and is made from a double-layered cotton material that makes it extremely thick and heavy. Its unique, cropped design has been particularly popular, especially the blue colorway​ (2)​. 3) Supreme x Tiffany & Co. Box Logo Tee: This collaboration between Supreme and Tiffany & Co. has been a huge hit, outselling even the Supreme Milan Box Logo Tee. The shirt combines the iconic motifs of both brands, resulting in a Tiffany Blue version of the white Box Logo T-shirt​ (3​). 4) Fear of God Essentials Pull-Over Hoodie (SS21): The Buttercream colorway of this hoodie was the most popular apparel item to release in 2021. The design is minimal, with no logos on the front and two rubberized logos on the back. It has sold over 10,000 units on StockX since its release in May 2021, demonstrating its widespread appeal​ (4)​. 5) Supreme Box Logo Hooded Sweatshirt (FW21): This sweatshirt was popular due to its traditional Box Logo design, which hadn't been released since the Fall/Winter season of 2017. It comes in nine different colors, adding to its appeal​ (5)​. 6) Gucci x The North Face Print Jacket: This jacket, part of a collaborative collection between Gucci and The North Face, has been particularly popular. It features a beige Gucci GG monogram print covering the entirety of the jacket's exterior and a combined brand logo on the left chest​ (6)​. 7) Chrome Hearts x Drake Girls Love Chrome Hoodie: This hoodie, part of a limited collection between Chrome Hearts and Drake, features bright yellow Chrome Hearts and Drake branding on both the front and back​ (7)​. 8) Eric Emanuel EE Basic Short: These shorts were particularly popular during the summer season of 2021. The Antique White / Yellow / Brown pair was one of the more popular colorways (​8)​. 9) Gallery Dept. Logo Trucker Hat: This brand had a significant turning point in 2021, becoming a favorite among the fashion-forward crowd. The brand's logo trucker hat was particularly popular​ (9)​. KEY BOX ** THE NUMBERS NEXT TO THE OUTPUT REPRESENT THE BROWSED SOURCES ONLINE **