I dont know about the specific brand your talking about but I do know about down sleeping bags and clothing (same rules should apply).
All down is not created equal. . Down comes in various grades and from various sources (the most common that I know of are duck and goose).
What's the ratio of down to feather? 70/30? 80/20? 90/10? 97/3?
And what bird did it come from?
Also whats the fill power and weight?
All this should be on a label sewn to the tq
As for the loft, the orientation of the fabric doesn't change the amount of space the down has to loft into, so it shouldnt make any difference. Though the fabric on the inner of most down products is generally looser to allow the down to loft around the body, reducing cold air space and feeling warmer to the user. The inner fabric is often softer and more breathable, as the outer fabric has to protect the down more.
You say that it lofts more with the black side out, this suggests to me that the black side is the inner, more breathable fabric, and that it lofts faster as it has more air being drawn in faster. Have you left it overnight in both directions to see?
If it is an old down product then maybe sending it to a specialist cleaning company will help as it could be that the down is getting clogged with greese and dirt over the years.. big companies like Rab and Montane offer such a service and can rejuvenate the loft and warmth of the bag to aprox 97% of the original value.
If the mix is 70/30 (down/feather) then you could possibly wash it yourself (check the weight of the tq and your machines capacity as the tq will hold 12x its weight in water) though it may take 5-6 weeks to dry properly in a warm room. And it can stink if its not goose down untill its totally dry.
There are no wrong ways to do things... Only alternative methods that don't work!!
Last edited by SurvivalStudent; 01-06-2013 at 22:16..