AND the mere fact that such designs are attracting attention online could pave the way for development of a mass market, said Joanne McNeil, a writer who covers Internet culture. On her blog “Internet of Dreams,” Ms. McNeil says that videos and mock-ups of not-yet-developed products, whether clothing or futuristic smartphones, are often popular online and may reflect the desires of a populace that larger corporations haven’t tapped. “Dreams outpace physical realities,” she said. In other words, even if stealth wear never becomes a viable or commercial reality, the newfound intrusiveness it responds to is genuine enough.