Pigeon shooting
The short answer is no, it isn’t – keeping still in the hide is of far more important than camo clothing.

The same applies to face masks, provided you can see the pigeons approaching, there’s no excuse for them to ever spot your face beaming over the top of the hide.

The one exception is when roost shooting, where birds can appear suddenly, and instantly spot your upturned face.

In these situations I personally like to wear a hat with some kind of brim, so that at least some of my face is hidden at all times.