The order of the layers
The Foundation's page on a maiko's dress describes the sequence: warm bintsuke hair oil spread thinly over the back, nape, neck and face; paste oshiroi dissolved in water and laid on with a flat brush; the surface evened with a puff; red at the eyes and brows; and rouge on the lips, the lower lip only in her first year. Newcomers are helped by their seniors until they can do it alone.
What is not on the official page
A time. Guides and studio blogs commonly say an experienced maiko needs around half an hour for the face and neck, and that the whole preparation with hair already set and the obi tied by a dresser takes about an hour. We treat those numbers as commonly reported, not confirmed.
The nape
The stripes of bare skin left on the nape, the 'ashi', are the detail most people notice and least people can explain. Two lines on ordinary days; three with the black crested kimono on formal days. This too is consistent across Kyoto sources without appearing on an official page, so the attire guide labels it accordingly.
What we will measure
Where an operator allows it, we will ask to watch a dressing session from the first brush to the tying of the obi, note the clock at each stage, and photograph the tools rather than the person. If no operator allows it, this note will say so.