I used used to use a "Birdiepal" umbrella http://www.ultralightoutdoorgear.co....umbrella-p3299 as a shelter. It's not big at all at 1m diameter. I had the art of setting up my sleeping/bivvy bag and getting undressed while holding it down to a tee. Then climbing in and pegging it down over my head with guy lines.Big fishing brollies are also quite useful for short trips in reasonable weather where you don't need a full tent.
In good weather it was great, it cut all the weight of carrying rain gear, but in the rain it was only any good for long distance walking where night time basically was just for sleeping.
I changed to the tarp route, but before I did I was considering one of these http://www.ultralightoutdoorgear.co.uk/search/sun-dial the smaller one. But I couldn't find much online about how sturdy they are, and the name implies that they may not be good in prolonged rain, if you can find anything abut them that I couldn't at the time, it may be a thought.
Of course, getting undressed under a small umbrella might get you barred from the campsites.
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Damn, I should have thought of that.Would think if you were on a camp site.you could use the showers.etc
Now your talking, that's my use.if out in the wild ??sure the birds n bees wouldn't care.