Apparatus and associated methods relate to spacers configured to be selectively and releasably coupled to at least one attachment region on a garment. In an illustrative example, each spacer may be provided with successive concentric walls and corresponding channels. The spacer may, for example, be provided with intersecting concentric and lateral channels. An (under)garment may be provided with at least one attachment region configured to releasably couple to the spacer. Various embodiments may advantageously provide tangential and/or radial fluid communication between a wearer's body and an outer garment disposed over the spacers.