Michael Thumpings grew up in a situation where he cared little of what people thought of him. His focus was instead on his family. He did what he thought was right, and that included the trivial things like the way he dressed. Some would consider his sense of fashion a bit scandalous but to him, it was comfortable. He was the prince of Talkar and divine descendant. Why should he care what others thought of his attire? When he's out on the water, soaking in those sweet rays, why shouldn't he expose himself to as much of the sun as possible? He was decent enough in his mind. Besides, those tight fitting speedos were quite cushy. Nina hadn't the heart to tell him what they really were, but couldn't help but relish in her little prank in getting her brother to begin wearing panties as a habit. In Michael's words: it kept everything 'as it should be.'