I am trying to find someone that can date fabric from the 1920quot;s
Some of the places that sell material have sheets of steel siding that they discount the price because of irregular lengths and colorsYou can save some thereAlso instead of a steel structure you can go with wood.
A group that can help in the USA is the American Textile History MuseumIt is actually much harder to date fabric than clothing since styles change, but fabric has not changed that much and the same fabric comes back in production even as the styles changeExamination gets done by looking at the yarn types and constructionFor example, some yarns have not been made since the early 1900's, but others from that period are still madeIf it has synthetics, you know it is not old.