Trim piece assembly for an article of apparel

A method of manufacturing a waistband assembly for a lower-body garment, the method comprising:

• affixing a first edge of a first trim piece to a perimeter edge of an exterior layer, the perimeter edge defining a waist opening of the lower-body garment, the exterior layer at least partially forming an external-facing surface of the lower-body garment, and the first trim piece positioned internal to the exterior layer;
• affixing an opposite second edge of the first trim piece to a lining layer edge of a lining layer, the lining layer at least partially forming an internal-facing surface of the lower-body garment, wherein the second edge of the first trim piece and the lining layer edge are not affixed to the exterior layer;
• positioning a second trim piece between the exterior layer and the first trim piece, wherein the second trim piece is at least partially folded along a length of the second trim piece to form a tunnel structure;
• and
• affixing the second trim piece to the first trim piece at one or more locations, wherein the second trim piece is not directly affixed to the exterior layer.

An article of apparel comprising:

• an exterior layer comprising at least a portion of an external-facing surface of the article of apparel, the exterior layer having a perimeter edge that at least partially defines a circumferential opening of the article of apparel;
• a lining layer comprising at least a portion of an internal-facing surface article of apparel, the lining layer having a lining layer edge;
• a first trim piece positioned internal to the exterior layer, the first trim piece having a first edge affixed to the perimeter edge and a second edge affixed to the lining layer edge;
• and
• a second trim piece positioned between the first trim piece and the exterior layer, the second trim piece partially folded along its length to form a tunnel structure, wherein the second trim piece is not affixed to the exterior layer.