Wilderness area are legal to hunt in given that the state (WDFW) as set a season in that area. Its no an exact overlay but for the most part wilderness areas are in a given GMU (GMU 203 Pasayten for instance). The high buck hunt is an early opportunity to for rifle and muzzle loaders to hunt curtain wilderness areas... not GMU's. During the general season many of those same wilderness areas are open to hunt again because those GMU's are open.
Archery equipment can be used in either Muzzle loader or Modern seasons but during all high buck hunts hunter orange is required. Many of the Wilderness areas are open for archery season because those GMU's are included in the early archery season. Again, if the wilderness area is open for High Buck at the same time as it is open for early season archery, hunter orange is required.
Wilderness.net is a great reference if you are looking for trails, boundaries etc.