Business clothing (business casual to semi-formal as appropriate) - COR guidebook (2015), p. 2, maybe showing a COR in business suit with necktie.
Non-BSA organization clothing (except military)
One of the above with BSA neckerchief and slide at a Scouting activity - Guide to Awards and Insignia, 2018 printing, section 1, Special Regulations, page 13 (upper right) - MAYBE - Other country Scouters do it…BSA appears to be restricting wearing a neckerchief with non-BSA-uniform clothing to Scouts.
A BSA field uniform with silver shoulder loops and chartered organization representative position emblem badge
2016 Uniform Inspection Sheet - Scout Leader, SKU 34068, Rev. 8/16, Tan/Olive-Green Uniform, male and female, (6568_103111_Ldr_UniformInspSheet_R12, 8/29/16 3:45 PM) - OBSOLESCENT - Written primarily for Unit Scouters. Visor caps have been replaced by ball caps.
COR with a unit position (multiple registered) field uniform
That brings us back to does the chartered organization representative who is also multiple registered as a Troop Committee member wear as a field uniform?
a. COR non-unit uniform with silver shoulder tabs?
b. Troop Committee uniform with unit numbers and silver shoulder tabs?
c. Troop Committee uniform with unit numbers and red should tabs?