I meant to mention that the lack of markings is consistent with Spanish. Their field gear rarely has anything on it, even current kit. Older uniform stuff also usually has nothing on it either, often because they liked using adhesive labels which (obviously) came off during use. However, since the 1980s the basic uniform components are pretty well marked. Though not necessarily easy to read due to wash/wear, the locations and styles are pretty consistent and therefore not difficult to confirm.