The mushanana is a drape, not a costume
It is a flowing garment, wrapped and pinned rather than constructed — and it is almost never worn alone. The bride’s mothers, sisters and attendants are usually dressed with her, which turns a single fitting into a coordinated set of them. Getting the palette to hold together across a group, in the light of the actual room, is the real work.
Two looks, one person
Most Rwandan brides wear a mushanana for the traditional ceremony and a Western-style gown for the church and reception. Handled badly, that reads as two different brides. Handled well, the second look answers the first — a colour carried through, a line echoed — so the day reads as one story.
Made to measure, and fitted again
Measurements taken months before a wedding are measurements taken of a different person. We fit, and then we fit again closer to the day.