Violet
Purple
noun, の adjective
A purple color is a violet color, mainly, for some reason, though I'll let "purple" slide as well.
The reading for 紫 is different from the one you learned with the kanji. To remember this reading, think about how the previous village you went to was all purple. It was the "村先" (むらさき) that you went to. Everything. Absolutely everything was purple.
彼女はいつも制服の上に紫色のベストを着ている。
She always wears a violet colored vest over her school uniform.