Work release programs vary by facility, so the most important first step is calling ahead and asking for their specific allowable items list before you arrive. Rules differ enough from one location to the next that showing up with the wrong things or missing what you need is a common and avoidable problem.
That said, here is a representative sample of what most work release facilities allow. Clothing should be plain with no lettering or logos, no hooded shirts or sweatshirts, and long pants are required. A typical storage allowance covers 4 shirts, 4 pants, 4 t-shirts, 4 pairs of socks, and 4 pairs of underwear, along with 2 washcloths and 2 sets of long underwear. Work-related items like boots, gloves, a hat, and a jacket are generally permitted in a designated lobby locker area.
Personal care items are usually allowed in their original containers: razors, shaving cream, shampoo, conditioner, toothpaste, toothbrush, mouthwash, deodorant, soap, and similar basics. Cold medications must be alcohol-free. Prescription medications are permitted.
For personal use you can typically bring a small number of books, a radio or CD player with earphones, writing supplies, stamps, and envelopes. Powder laundry detergent is usually permitted.
What is not allowed is just as important. No food or beverages from outside, no glass containers, no tools, no magazines, no handheld games or computers. Cell phones, tobacco, matches, and lighters must stay in the lobby locker and cannot come into the living area. Bedding is provided by the facility.
Call before you go and confirm the specific list for your location.