You may not be all at fault here, there is a thing called color temperature of lighting, each type of bulb, fluorescent(several temperatures from warm to cool to daylight), incandescent, and others will warm or cool the color being viewed under it. True colors show best under natural light, but even the time of day can affect color. That being said, if you see a photo or picture of anything that appeals to you study the coloring or take it with you shopping. Pay attention to the percentages in which they were used. You can develop a color memory just like anything else, if you already realize that green is not green but yellow or blue green, that reds are purplish or orangish, you are halfway there, so many people see red or green and do not make any further color distinctions.
It is admittedly easier where the mfgrs have put fabrics together in a collection, but much more fun to build your own,
(retired interior designer speaking here).Pat
