Abstract: An adjustable rack apparatus for holding work pieces of a sewing machine is provided. The adjustable rack apparatus is installed on one side of a sewing machine's work platform. The apparatus comprises a rack base assembly to which are coupled a clamp mechanism, a work piece capture mechanism, and a pallet assembly, the height of which relative to the rack base assembly may be readily adjusted. The adjustable rack apparatus is preferably employed to support and hold a stack of trouser pieces before, during, and after a sewing operation sequentially performed thereon. The order of the trouser pieces in the given stack is thereby preserved, and the efficiency of the overall manufacturing operation is enhanced.