A shirt should be cared for and washed according to the care instructions on the label. It should be ironed while it is still a bit damp after the wash. A good iron should be used. Collar stays can also be used to keep them in shape. A good iron and hanger can keep them looking fresh.
It sounds like you might be referring to inside a man's shirt collar. The only way to keep a collar from discoloring permanently is to treat it each time you wash it. You can either use a pre-treating product (like Shout or a stain stick) or, before you put it in the washer, apply a little of your detergent (if you use dry, add a little water to make a paste) to the affected area of the collar and rub with a small brush (an old toothbrush will work). If you opt to use the second suggestion, be careful not to brush too hard as this will prematurely wear out the fabric.
it depends on the kind of sportsjacket and shirt you have
A polo shirt is T-shaped shirt with a collar, typically a two- or three-button placket, and an optional pocket. Without collar, a shirt can not be called polo shirt.
The button is designed to keep the collar from rolling upwards and exposing the inside of the collar band underneath. This is specially important if the collar is a soft non fused collar that can roll easily.
A shirt collar can be ironed by laying the collar as flat as possible. Using the tip of the iron is best to get into corners easily.
A cravat is worn inside a shirt collar.
Lemon or Lime juice
Difference between polo shirts and Rugby ( golf shirts) is Collar. Each polo shirt has a kitted collar while the Rugby shirt has a two piece collar ( may be woven collar).
a collar
theres a costume
With string on the collar of your shirt.
Contrast-Collar Dress Shirts
The shirt's collar is frayed.He was shocked at the shirt's price.The shirt's material is cotton.