Today film and television seems overly much to clothe the people and places of the middle ages in shades of grey and black ( ironically one of the most expensive colours available in the past ), of faded greens and browns and all other variants down to mud. Dingy grunge seems the order of the day to the wardrobe department. Medieval manuscripts by contrast record a world of colour in dress and so do the surviving remains of painted decoration for buildings. This should not be dismissed as garish or crude - that is not suggested by the overwhelming number of surviving manuscripts or stained glass.
These points are well set out and handsomely illustrated in a short and succinct online piece from five years ago by James B Shannon which can be seen here.