This girl has had 'stripes' appearing in her coat in different locations up and down her back for months. I'd worry about her having a skin problem, she so very obviously is gleaming with good health that doesn't seem likely. There's no brindling in her background either.
satin argente sire x marked champagne dam, both from tri litters. Probably another weird tri thing....the hair in those stripes appear to have been but, but I've seen no barbering going on in that group. And the dark bands seem to shift every couple of weeks.