It is a white flag divided by two vertical horizontal light blue (B-)
stripes. The ratio of the stripes is approx. 7:4:7:4:7, perhaps 2:1:2:1:2.
Source: I spotted this flag in Tarxien on 2 October 2008 Klaus-Michael
Schneider, 15 October 2008
Flags of
Maltese marching bands and local clubs are mostly complex designs
featuring armorial elements and similar ornaments; the national flag and
the banners of arms flags of the Local Councils are stark and simple in
comparison.
The video at http://www.youtube.com/watch?v=GGD0H4zjJeo (St. Andrew's
day in Luqa, apparently in 2009) shows a set of still photos featuring mostly
the former kind, but a few of the latter stick out: At 0:35-0:40 and 0:47-1:01, five stills show a vertically divided white
and blue flag, which may be a simplified version of any of several Local
Council flags. This design tentatively named (for Tarxien
LC) and attached.
The title and comments of this video include the word bnadar, which
seems to be a variant of bandiera ("flag") António Martins-Tuválkin,
29 December 2010