The sources Kronoskaf mentions are:
Leach, Jeff, Swedish Jägar Units of the Seven Years War – Part 1: Köhler's and Schwarter's Companies, Seven Years War Association Journal Vol. X No. 1
This together with the articles of Dan Schorr and Pengel are probably the best sources in English although Schorr seems to disagree with Pengel and states yellow buttonholes instead of white and Schorr does not believe in any lapels used. Having read these english articles as well as the works of Bellander and Säwe in Swedish, my conclusions are the following (I find Kronoskaf a bit unclear…please niote that there are at least three different von Scwartzer involved on the Swedish side):
1757 Johan Kristoffe von Schwartzer sets up a 100 man squadron of Horse Jägers. These were strengthened with another 100 men in 1758. Uniform unknown.
1758 Fredrik Ulrik Putbus sets up a Foot Hussar unit of 50+50 men. Uniform most likely the same as the Blue Hussars since it was attached to this unit
1758 Johan von Böhnen sets up a 600 men strong Free Corps. Uniform unknown. This consisted of a lot of foreign deseters recruited in the Danzig area. When I eventually will build ny 28mm forces I will use a ragtag mix of civilian, Prussian and Swedish uniforms
In 1761 there were additional units formed:
Hans Fredrick von Köhler and Carl Wilhelm von Schwartzer each sets up a foot jäger company of 100 men. These units had green coats and probably(?) no lapels but yellow buttonholes, cuffs and collar.
In the summer another free company was formed commanded by captain Lillie and later on this year three more companies were formed under Harald Ehrenhjelm, Lundeberg and (Göran Magnus) Sprengtporten. Each of these companies were equipped with two small artillery guns pulled by one horse each.
Hope this helps :)