There are no accessories that start with the letter X. Fashion, tech, and travel gear all have long lists of items for every letter, but X stays empty. Even a wide search through jewelry, bags, hats, belts, and phone add-ons turns up no common accessory whose name begins with X.
The reason is simple. X is one of the rarest starting letters in English. Most words that begin with X come from Greek, such as xylophone and xenon, and they name science terms or instruments, not things people wear or carry. English never borrowed an everyday accessory word that starts with X. Most accessory names come from old trades, like hats, gloves, and scarves, or from French and Italian words for clothing, and none of these start with X.
A few items come close. The xylophone-style bracelet and the X-shaped hair clip use the letter in their look or design, but their names do not start with it. Some brands use X in product names, such as X-Pro camera straps or Xbox controller grips, yet these are brand labels, not types of accessory. People who search this term are usually looking for unusual or brand-led gear, and those ideas fit better under the letters that follow the real names of the products.