Ok maybe you could call it a kilt. Accurate Shooter posted a kilt that fits on your spotting scope tripod. The kilt has pockets and provides quick access to items while keeping them stored without extra bulk.

According to Accurate shooter:

Here’s a clever product from Good Shooting Sales & Service, a shop operated by National Smallbore Silhouette Champion Cathy Winstead-Severin and her husband Jim Severin. The Shooting Skirt, available in either Nylon Mesh or Cordura/Mesh for $32.00, is a cone-shaped, fabric gear-holder that fits around the top of a tripod. The Shooting Skirt has various pockets that can store score cards, timers, Walkie-Talkies, spotting boards, and other accessories. The Shooting Skirt even has a water bottle holder. (Note: the Cordura/Mesh combo version is out of stock, but the all-mesh version is in available.)