T-shirt operation bulletin (OB)

In industrial t-shirt manufacturing, an OB is another tool used by the production team. The full form of OB is Operation Bulletin. Normally, an operation bulletin is prepared by the industrial engineering department prior to the line setup. OB making and getting standard time of the t-shirt design is important for labor cost estimation. The main purpose of making an OB is explained in this article.

In this post, I will be sharing an OB of a crew neck t-shirt. A t-shirt with neck rib and back neck tape. No moon patch is there in the back yoke. No pipping is attached to the shoulder seam.

The machine calculation and manpower calculation are made for making 1200 t-shirts daily. Stitch and finishing and packing operations are added in this operation bulletin. Being a newcomer, this OB (in sequence) will help you understand sewing operations. And standard time will give you an idea of how many manpower requirements and machines need to be allocated. In this OB, I have also shared machine types to be used for different operations. 

In this operation bulletin, manpower and machine requirements are calculated at 80% line efficiency and 5% operator absenteeism. 

t-shirt operation bulletin

You can use the above template for making your t-shirt OB. In case, stitched garment checking, ironing and packing done in different section, remove the last three operations from the above OB.  


  • List of operations will change for a different t-shirt design.
  • Machine requirements for making t-shirts will vary for different designs
  • The number of sewing machines and operators' requirements will depend on the daily production target.
  • SAM value shown in the above OB may vary from case to case.

Prasanta Sarkar

Prasanta Sarkar is a textile engineer and a postgraduate in fashion technology from NIFT, New Delhi, India. He has authored 6 books in the field of garment manufacturing technology, garment business setup, and industrial engineering. He loves writing how-to guide articles in the fashion industry niche. He has been working in the apparel manufacturing industry since 2006. He has visited garment factories in many countries and implemented process improvement projects in numerous garment units in different continents including Asia, Europe, and South Africa. He is the founder and editor of the Online Clothing Study Blog.

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