Question

With good fortune, I bought a new clunker.
One of its advantages is that the fabric lining the roof on the inside isn’t attached in place, but falls onto the passengers’ heads.
A new one costs four figures,
so I drive around like this and I’m happy that I’m saving money.
My question:
On the way I say the Traveler’s Prayer, and maybe other blessings, prayers, words of Torah, and even God’s name.
Can the roof drooping onto my head count as a big, righteous kippah?
Or does it specifically have to be a kippah?