Guys like this:
http://www.worldwar2.ro/foto/?id=479§ion=6&article=29
or not too far off. Also radio operators and the like; figures for a command stand of course. Any reasonably simple dress, it's the headgear that would count in this case.
Hi Lentulus
For an officer you are looking at SCW90 - Carlist Officer, firing pistol, leather jacket, boots
(http://www.pendraken.co.uk/ProductImages/SCW90.jpg)
The beret has ribbons but they can be trimmed off, for others in this range look at http://www.pendraken.co.uk/Inter-War-c18/SCW-Carlist-Requetes-Banderas-de-Navarra-sc213/ (http://www.pendraken.co.uk/Inter-War-c18/SCW-Carlist-Requetes-Banderas-de-Navarra-sc213/), otherwise somebody with more knowledge of British Airborne might be able to point you at other figures. Be aware that the Romanian cavalry has a strange curved rifle that might lead to disappointment :D. Obviously designed to shoot around corners.
Cheers
GrumpyOldMan