No books, but some possible hits of 1808-09 war and also some more wider scope of swedish uniforms

https://en.wikipedia.org/wiki/Finnish_War
http://kaponieeri.blogspot.com/2018/11/suomen-sodan-sotilaspukuja.html
https://www.napoleon-series.org/military/organization/Sweden/Organization/c_swedisharmy.html
https://nypl.getarchive.net/collections/sweden-military-history?page=1
http://runeberg.org/finskakr/
http://www.narc.fi/1809opetusaineisto/albumi/index.html
http://mazikainen.blogspot.com/2011/11/some-uniform-plates-for-russo-swedish.html
https://fi.pinterest.com/coalwellmcdonald/sweden/

See? knowledgeable people.

Thanks for the help. I'll start looking through all this stuff.

the pdfbook from the historybookman is full of detail and coloured art work and i used it for my Sedish army. happy to recommend it along with the others in the series

Yes, the Rawkins book looks like it will suit admirably.

again, thanks.