Wife of a Scottish officer stationed in Flanders in the 1700s, riding, carrying a small child and a flask, dressed in a blue bonnet and an ankle-length earasaid or plaid
Unknown author<span style="display: none;">Unknown author</span>
<p>Proximate source: <a rel="nofollow" class="external free" href="http://www.scottishtartans.co.uk/Musings_on_the_arisaid_and_other_female_dress.pdf">http://www.scottishtartans.co.uk/Musings_on_the_arisaid_and_other_female_dress.pdf</a>
...which in turn cites 
"Munro, R. W. Highland Clans &amp; Tartans. Octopus Books. London 1977"
</p>
Originally published in the 1700s.