Graduation announcements etiquette?

I m preparing to send out my college graduation announcements, and the ones I ordered came with plain envelopes. I was considering buying foil lined envelopes since I now have the dimensions of the outer envelope that fits the announcement. My question is when you normally have foil lined envelopes, are both... show more I m preparing to send out my college graduation announcements, and the ones I ordered came with plain envelopes. I was considering buying foil lined envelopes since I now have the dimensions of the outer envelope that fits the announcement.

My question is when you normally have foil lined envelopes, are both envelopes foil lined or just the outer envelope?
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