After messing about with feathers for a bit, I clip Dave out fully now too but leave his tail a bit longer - because he's very dark blue roan but his tail is white it's a good way to keep an eye on him when walking at dusk too
For us it's the easiest way to keep him because we walk in a very muddy sandy forest everyday and if he's got feathers he gets tangled up in stuff. He's happy clipped without a coat (he runs the whole time so stays warm that way), I also think fit cockers look lovely when clipped and the house is a lot less smeggy! So go for it even if they take off more than you'd wanted it always grows back again... very quickly so don't worry too much!
Hannah x