Article in English: If it’s a new uniform, make sure to wash and dry once before sewing on the patch, otherwise, the fabric will bunch unevenly under the patch after the first wash and dry cycle.  Many uniforms are made out of cotton. Cotton will usually shrink somewhat after the first wash. If you sew a patch onto your uniform before it has been washed then the fabric under the patch will shrink and pull your patch, bunching it. It is also a good idea to iron the area where the patch is to be placed before starting to sew. Ironing the area will remove any wrinkles. If you sew your patch over wrinkles then your uniform will be permanently wrinkled. Choose a thread that is either the color of the uniform or the color of the edge of the patch.  If you can’t find a thread that’s the same color as either, look for a darker color that’s as close as possible. Darker rather than lighter thread will blend better and not show up as blatantly. You can also get a clear thread to make it less visible. Some patches such as those on military uniforms need to be placed in a specific area.  For example, if you need to sew on an American flag patch you need to place it on the shoulder/bicep area of the sleeve. The flag also needs to be placed so it’s facing the right direction. The American flag should always be positioned so that when the wearer is moving forward, it gives the flag the effect of waving in the wind, moving forward.   Check with your superiors to make sure you are placing patches in the correct places. If you're not very familiar with sewing, you may want to start with a piece of thread no longer than 18 inches (45cm). Longer pieces tend to get tangled and are harder to work with than shorter ones.  Alternatively, you can try not cutting the thread and leaving it on the spool. This will help prevent the thread from getting tangled as well. Additionally, you won’t have to worry about running out of thread and re-threading your needle. Cut any loose threads that are hanging beyond the knot. You should leave a little thread about...

Summary in Vietnamese:
Giặt, phơi khô và là phẳng đồng phục trước khi bắt đầu khâu. Chọn kim khâu và chỉ. Đặt phù hiệu đúng vị trí. Cắt một đoạn chỉ. Cắt đầu chỉ.