An enclosure is removably securable to a support member including a first part of a releasable fastener. The enclosure includes a panel of material sized to enclose the support member. A flexible flap is affixed to the panel, and a second part of the releasable fastener is affixed to the flexible flap. The second part of the releasable fastener is positioned for engagement with the first part when the panel encloses the support member. By affixing the second part of the releasable fastener to the flexible flap, the position of the fastener is adjustable to accommodate panel shrinkage, manufacturing tolerances and the like.