Abstract.The development of fashion trends that always change every year relative to influencing consumer behavior in purchasing goods according to changes in the fashion trend is affected by the behavior of consumers of muslima who come from students. The research problem formulation aims to find out: 1) Consumption behavior in Islam,2) Consumption behavior of Shari'a Faculty students at the 2016 Islamic Economics Law Study Program at UNISBA towards purchasing goods (fashion trend),3) Analysis of the behavior of Muslim consumers towards the purchase of goods at the Shari'ah Faculty students of the 2016 Islamic Economics Law study program at UNISBA. His study uses a descriptive method with a qualitative approach. Data collection through questionnaires, observation, interviews, and documentation. Primary data sources are Syari'ah Faculty of Islamic Economics Law Study Program class of 2016 UNISBA and secondary data sources in the form of documents relating to consumption behavior, profile of the Shari'ah Faculty of UNISBA Sharia Economics Law study program, and others. Based on the results of the study, it was concluded that:1) Consumption behavior in Islam must be based on five basic principles, namely the principle of justice, the principle of cleanliness, the principle of simplicity, the principle of generosity, and the principle of morality. 2) From the observations of the behavior of Syari'a Faculty students at the 2016 Syari'ah Economics Law Study Program, UNISBA in consumption behavior did not pay attention to the basic principles of Islamic consumption behavior and purchasing decision behavior is strongly influenced by social factors and psychological factors. 3) Referring to the basic principles of Islamic consumption behavior, most of the students of the Syari'ah Faculty of Islamic Economics Law Study Program class of 2016 UNISBA are not yet in accordance with the basic principles of Islamic consumption behavior. Keywords: Muslim consumer behavior, purchase of goods, consumption of Islam.  Abstrak. Perkembangan trend fashion yang selalu berganti setiap tahun relatif mempengaruhi perilaku konsumen dalam pembelian barang sesuai perubahan trend fashion terhadap perilaku konsumen muslimah yang berasal dari mahasiswa. Rumusan masalah penelitian bertujuan untuk mengetahui : 1) Perilaku konsumsi dalam islam, 2)Perilaku konsumsi mahasiswi Fakultas syari’ah prodi Hukum Ekonomi Syariah angkatan 2016 UNISBA terhadap pembelian barang(trend fashion), 3)Analisis perilaku konsumsen muslimah terhadap pembelian barang pada mahasiswi Fakultas syari’ah prodi Hukum Ekonomi Syariah angkatan 2016 UNISBA. Penelitian ini menggunakan metode deskriptif dengan pendekatan kualitatif. Pengumpulan data melalui kuesioner, observasi, wawancara, dan dokumentasi. Sumber data primer yaitu Fakultas Syari’ah prodi Hukum Ekonomi Syariah angkatan 2016 UNISBA dan sumber data sekunder berupa dokumen yang berkaitan dengan perilaku konsumsi, profil Fakultas syari’ah prodi Hukum Ekonomi Syariah UNISBA, dan lainnya. Berdasarkan hasil penelitian, disimpulkan bahwa: 1)Perilaku konsumsi dalam Islam harus berlandaskan 5 prinsip dasar yaitu prinsip keadilan,prinsip kebersihan,prinsip kesederhanan, prinsip kemurahan hati, dan prinsip moralitas. 2)Dari hasil observasi perilaku mahasiswi Fakultas Syari’ah prodi Hukum Ekonomi Syari’ah angkatan 2016 UNISBA dalam perilaku konsumsi tidak memperhatikan prinsip-prinsip dasar perilaku konsumsi Islam dan perilaku keputusan pembelian sangat dipengaruhi oleh faktor sosial dan faktor pisikologis. 3)Mengacu kepada prinsip dasar perilaku konsumsi Islam, sebagian besar mahasiswi Fakultas Syari’ah Prodi Hukum Ekonomi Islam angkatan 2016 UNISBA belum sesuai dengan prinsip dasar perilaku konsumsi Islam. Kata kunci : Perilaku konsumen muslimah, pembelian barang, konsumsi Islam.