TM 10-8400-201-23 2-5.  REPAIR AND MAINTENANCE OF UNIFORMS-Continued NOTE Iron-on patches are suitable for use on the utility shirt and trousers when garment appearance is not first priority. (a)  Patch size.  The iron-on patch shall be cut to the size and shape that it will extend approximately 3/4 inch (1.91 cm) in all directions beyond the tear or other damage.  Patches will have rounded corners. (b)   Patching  procedure  for  iron-on  patches.    When  patching  by  hand  iron,  place  patch  to  the  inside  of  the garment The garment may be turned Inside out or the patch may be inserted within the garment, taking care that the patch is centered In the desired position.  Trim heavily ravelled ends with scissors.  Smooth out the area to be patches so that the tear is closed or very nearly closed, and so there will be no wrinkles, folds, seams, or other protrusions under the iron when it is applied (fig. 2-3). Pre-warm the area to be patched by pressing with a household electric dry Iron or steam Iron used dry.  With the  iron  set  at  the  cotton  indicator  or  as  high  as  possible  without  scorching  the  fabric,  apply  the  iron  for  5 seconds or more. Immediately position the patch.  Hold the iron on the patch for above 12 seconds. Figure 2-3.  Preparing a tear for patching 2-7