Gloves. Some people prefer them, some don’t. Obviously they help with sanitation but one drawback is that you are not able to feel for quality materials as easily!
Mask during COVID this is a must. But normally it can be a good idea if you have allergies as there is a lot of dust and other particles going around the warehouse.
Large Bag or preferably an Ikea bag! At the bins in Seattle, it is extremely hard to get a cart so it is a good idea to have a large bag to throw things in and this also prevents you from having to carry around several different ones
Hand Sanitizer or wipes, it gets dirty in there.
Crossbody Purse or Belt Bag. Honestly one of my biggest fears is losing something or having someone take my purse or coat thinking it is something from one of the bins. Bring minimal items and keep them close to you!