Cover letter Dear Editors, I am pleased to submit a review article entitled “A Review on Ionic and Nonionic Dyeing of Polyester fiber for Pre-garment Processing “for publication in your esteemed Journal (Textile Research Journal). In this review article, we developed the dyeing of polyester fibers using both ionic and nonionic dyes, emphasizing the importance of sustainable dyeing, mechanism such as surface modification techniques with plasma, ultrasonic waves, ozone exposure, and chitosan. These modifications introduce reactive functional groups that enhance the fiber's compatibility with ionic dyes, which are favored for their reactivity compared to nonionic dyes alternatives. Despite existing literature on the application of these dyes for polyester, comprehensive reviews remain scarce. The findings of this review elucidate the mechanisms involved in sustainable dyeing polyester and its blends with ionic and nonionic dyes, highlighting aspects such as surface modification, improved light fastness, enhanced shade formation, and the chemical interactions between the functional groups on polyester fibers and ionic dyes. Our manuscript will give a clear message to readers and scientists about the alternative and sustainable dyeing of polyester fiber in pre garment processing. This manuscript has not been published and is not under consideration for publication elsewhere. All authors listed in the paper have agreed to the submission of the manuscript. In addition, we have no conflicts of interest to disclose. We would be pleased if you would consider the manuscript for publication. Yours sincerely, Mr. Girma Moges (Corresponding author) Reviewers 1. Prof. Dr. Elisabeth Eppinger Email: elisabeth.eppinger@htw-berlin.de University: University of Applied Science for Economics and Technology Berlin 2. Dr. Yingjiao Xu Email: yxu11@ncsu.edu University: Wilson College of Textiles 3. Prof .Delia Dumitrescu Email: delia.dumitrescu@hb.se University: The Swedish school of textiles 4. Prof. Dr. Sema PALAMUTCU Email: spalamut@pau.edu.tr University: Istanbul Technical University