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@greeno
Had the same issue with my Concorde, seller said it was 26.8 so I went with it. It’s 27.2.
If the seatpost slips in too easily it’s likely too small. Though may not be the case if your seat tube is already deformed at the top.
I’d have thought it would more likely be 27.2 than 27. Do you have a larger seatpost to try? You may need to very gently pry it open with a screwdriver to get it in the first bit. Not sure that's a recommended approach so don't necessarily listen to my advice.
What’s the tubing? Google it and see what you find. Mine was Columbus Brain which was largely 27.2.