Hunting was supposed to require the outfits to hide yourself in each environment, but due to a bug this has never worked. The Hunting Experts still reference them working, and also mention smoking traps with a lit torch.

The smoking traps part might actually work, but I'm not sure if it's been thoroughly tested or if people are going based on bias / placebo / outdated info. The OSRS dev team tried fixing the outfit bug in the past, but they decided it wasn't worth it.