as an avid ebay buyer/ seller I really do believe that in time all things "wanted" will be offered there. My Father-in-law had a short story published in a "pulp" back in 1949 and my MIL had been looking for a copy of it for years. It took me 3 months on ebay of searching and we finally found it (this is with no date and only searching by author's name...)

That said, this may not be what you were looing for but may be useful?

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Good luck and happy sewing!

Here is a link that might be useful: irish dress pattern instructions

You can call up the pattern company. If they have one in stock they will sell it to you. I did this once with a discontinued Robe.

Do you have the pattern #? Simplicity on-line has a section of patterns out of print, but I looked and didn't see an Irish costume. I agree with ColleenNY, my best guess would be to call the company.

Here is one.

Here is a link that might be useful: dress pattern