Fabric seconds can mean a dye lot was not the exact color as the one before, sometimes the prints don't line up 100%, could be a thread leaves a little nub on the top of the fabric but, most of the time it's really hard to find the 2nd part. Top name companies cannot (or shouldn't) sell 2nds for top dollar, so they go elsewhere. Sometimes they are the first runs on lesser quality fabric to test out the new line of prints.
Brenda