Abstract: Single piece and multi-piece collar support/structure devices utilize durable and flexible materials and are configured to support and aid in maintaining structure, shape, and form throughout a shirt collar, as well reducing time for pressing. The design and location of collar support/structure devices is to be formfitting and sewn inside the fabrics and seams of the collar in a pocket. Collar support/structure devices are disposed into collars of garments as non-removable devices in permanently sealed pockets, and are also disposed into collars of garments as removable devices in pockets that are not permanently sealed. Collar support/structure devices substantially conform to shapes of collars in the pockets, and vary in thickness in proportion to material of the collars. Single piece devices optionally include portions having increased flexibility via cut-outs, thinner material, and woven inserts. Methods of forming articles of clothing having collar support/structure devices are also described.