Understanding fiber content
Getting out stains is highly dependent on the types of fibers that make up the garment. I am not speaking about satin, or chenille or gabardine, these are types of weave. It is the fibers that should be denoted on a garments label. Man-made fibers such as: polyester, nylon, acetate require different care as opposed to natural fibers: silk, wool, cotton, linen, which are from plants or animals. To make matters more complicated within man-made and natural fibers there are restrictions too. For example you need extreme caution when using any ammonia on a silk or wool but it is fine for cotton and linen.
Cleaning one item of a suit
It is never a good idea to clean only one part of a suit. In the cleaning process subtle changes can occur with the feel of a fabric or a slight loss of dye, especially in silks or linens. A suit cleaned together may have slight color loss unrecognizable to the human eye, but if the pieces are cleaned separately a slight color difference can be become noticeable.
Blood, human or from an animal, as in from a steak, should be treated quickly. It if is diluted quickly with water and a touch of soap or detergent it will usually wash out completely. If it is left to dry for several days the blood will have time to react with oxygen in the air and will much more difficult or even impossible to remove. Overall it is important to wash the garment within a day or two or get it to us to take care of.