Kemajuan teknologi informasi telah mendorong transformasi dalam sektor perdagangan, termasuk penjualan pakaian secara online. Website dirancang untuk mempermudah proses penjualan, meningkatkan efisiensi operasional, serta memberikan pengalaman belanja yang lebih nyaman bagi pelanggan. Penelitian ini bertujuan untuk merancang dan mengembangkan website penjualan pakaian berbasis web yang efisien, mudah digunakan, dan mendukung kebutuhan pelanggan serta pebisnis.Metodologi pengembangan sistem menggunakan pendekatan waterfall yang meliputi identifikasi masalah, tinjauan literatur, pengumpulan data, analisis kebutuhan, perancangan sistem, dan implementasi. Sistem yang dirancang mencakup fitur utama seperti katalog produk, keranjang belanja, sistem pembayaran, dan pengelolaan data pelanggan. Untuk memvisualisasikan alur kerja dan struktur sistem, digunakan diagram UML, termasuk use case, activity diagram, dan sequence diagram.Hasil penelitian menunjukkan bahwa sistem ini mampu meningkatkan efisiensi operasional dan memperluas jangkauan pemasaran produk. Dengan adanya platform ini, konsumen dapat dengan mudah melakukan pemesanan tanpa harus datang langsung ke toko, sementara pelaku usaha dapat mengelola transaksi dan inventaris dengan lebih baik. Sistem ini diharapkan menjadi solusi efektif dalam mendukung aktivitas bisnis di era digital. Advances in information technology have driven transformation in the trade sector, including online clothing sales. The web-based information system is designed to simplify the sales process, increase operational efficiency, and provide a more comfortable shopping experience for customers. This research aims to design and develop a web-based clothing sales information system that is efficient, easy to use, and supports the needs of customers and business people. The system development methodology uses a waterfall approach which includes problem identification, literature review, data collection, needs analysis, system design, and implementation. The system design includes main features such as product catalogs, shopping carts, payment systems, and customer data management. To visualize the workflow and system structure, UML diagrams are used, including use cases, activity diagrams, and sequence diagrams. The research results show that this system is able to increase operational efficiency and expand product marketing reach. With this platform, consumers can easily place orders without having to come directly to the store, while business people can manage transactions and inventory better. This system is expected to be an effective solution in supporting business activities in the digital era.