Here are a few interesting and/or related links.
http://www.australiandressregister.org An online register of dress with an Australian provenance pre-1975.
http://migrationheritage.nsw.gov.au/exhibition/objectsthroughtime/convictbutton Part of a history resource. This page shows a convict button and explains its history.
https://www.coles.com.au/about-coles/centenary A history of the company.
http://localhistory.kingston.vic.gov.au/htm/article/579.htm A history of the Semco company.
http://www.thimbleselect.com A site to buy and learn out thimbles from Australia and elsewhere. Also some other sewing collectibles.
http://crazyhaberdasher.blogspot.com.au/ A fellow collector’s blog.
http://www.vicbuttonclub.com.au Website of the Victorian Button Collectors Club. Meets monthly in Burwood East.
http://trove.nla.gov.au Website of the National Library of Australia.
http://www.naa.gov.au Website of the National Archives of Australia. A wonderful resource.