Disclosed are a clothing with a sag-preventive member as well as a device and a method for manufacturing such a clothing. The sag-preventive member is installed in such a manner that a layer sheet (1) comprising an adhesive layer (12) having an adhesive strength or degree of tackiness and flexibility, and a film layer (11) are mounted on the respective clothing (2) with the film layer (11) facing the cloth (2) side.
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