Should they have all been wearing silver jumpsuits or something?
The pilots' uniforms and casual wear seemed pretty good to me. Can't be easy to invent an entire new style of clothing for a culture that isn't based either on Earth or, worse yet, standard sci fi tropes.
And to design and create all those costumes would have pushed up the budget significantly. One reason BSG survived on skiffy is because it stuck to a modest budget. With only a few million viewers, they have to cut somewhere.