Some interesting bits from the associated Wikipedia article https://en.wikipedia.org/wiki/Men%27s_D ... form_Party
John Carl Flügel, a psychologist and member of the MDRP, claimed since the end of the 18th century men had been ignoring the colorful, elaborate, and varied forms of "masculine ornamentation." He called this time the Great Masculine Renunciation. "Man," Flügel claimed, had "abandoned his claim to be considered beautiful. He henceforth aimed at only being useful."
I was already familiar with some of the sunlight, nudist, and Freikörperkultur societies of this era, but had not heard of this one before.The MDRP sought to improve the health and hygiene of men by changing their dress, as they saw the typical male styles and materials growing more restrictive and harmful, while women's clothing was increasingly becoming more "emancipating". Their goals included "freeing the neck" by wearing the "Byron collar" which was an open-front collar, and gaining approval of the kilt as everyday wear for men. They also preferred blouses instead of shirts, sandals over shoes, and shorts or breeches to trousers.