The squadron which the 2. Schlesisches Husaren-Regiment sent to the new 8. Husaren-Regiment was its 4th squadron, dressed in red.
In 1813, the 3rd and 4th squadron of the 2. Schlesisches Husaren-Regiment had been sent to form the nucleus of Hellwig's Freikorps. In 1813, they received red uniforms of British origin, together with the other two squadrons raised by Hellwig (and there was an additonal squadron of Freiwillige Jäger, in green litewkas).
In 1814, after the war, the two old squadrons came back to the 2. Schlesisches Husaren-Regiment (they had been considered as "detached" only), the newly raised squadrons remained with Hellwig, to end up in the 7. Ulanen-Regiment.
So in 1815, you will find Hellwig's red hussar uniforms in the 2. Schlesisches Husaren-Regiment (3rd squadron), in the 8. Husaren-Regiment and in the 7. Ulanen-Regiment.
Possibly, only those in the 7. Ulanen-Regiment had colpacks. The sources are silent on the head dresses of the two hussar regiments in 1815.