I agree that if you're a summer silver s your metal - can't see how this didn't come up as the first thing they do to determine whether you're 'cool' or warm' is check how gold and silver look against your face.
I'm also a summer (sweet pea), but I think the palette is basically the same - it's just the proportions of how you mix them up, or which ones are your 100% colours that changes.
I've built up a few silver items accessory-wise, plus I find dark navy useful - not as easy to find as black. Then I have a few sort of creamy-brown/grey pearly things. Basically I try and cover all my neutral shades, so I can always match whatever I wear.
Belts - have a blue, grey, nude, dark red, brown, teal - again can match with most of my neutrals and everything goes with denim anyway.