The secret is not what you have, but how you use it - and this is a great ‘leveller’.
The key clothing requirements are protection from the weather and subdued colours. Camouflaged clothing helps, but is not essential, and hunters remain successful in subdued colours (green, brown, black, grey). Birds have colour vision and excellent eyesight, and are particularly good at picking up short wavelengths, so avoid blue colours!
Covering your face will improve your odds significantly, and face nets or camo paint are inexpensive items.
Above all, dress to keep warm and dry and focus on technique rather than gear!