Hi Hoshi, Maybe Im greedy but I tend to have lots too.
I have two horses and each horse has:
2 H/weight turnouts
2 M/weight turnouts
2 l/weight turnouts
And same for inside!!!
2 heavy, and loads of fleeces/underblankets. I always tend to have more than I need, this way if any tear or get soaked etc, I've always got one on backup. You could manage with a few, say lightweight rugs and depending on the weather just add or remove underblankets.
It all depends on how you keep your cob etc, I.e in on a nite or out all the time etc