The school swimsuit was originally designed as sportswear suitable for swimming pools and athletic performance. However, it's known that in the past, extremely thin swimsuits which became nearly transparent when wet were actually sold commercially. Elite swimmers during the Showa era reportedly adopted a mindset of total focus on swimming, unconcerned about transparency or being secretly photographed. While these swimsuits served purely functional purposes, by today's standards they carry distinct erotic elements. The transparency of this white swimsuit is extraordinary—appearing almost nude, yet technically still clothed. This "clothed yet transparent" state embodies the very origin of clothing fetishism. What heightens the erotic appeal is that the garment in question was an officially licensed sports swimsuit available to the general public. Presenting an erotic video collection featuring a big-breasted girl changing into four different types of such vintage transparent school swimsuits, showcasing her wet, see-through figure. Experience to the fullest the extreme transparency of authentic, no-longer-available competitive swimsuits—a definitive celebration of sheer swimsuit fetishism.