  The most detailed constructions of microstate geometries, and particularly of
superstrata, are done using $\mathcal{N} = (1,0)$ supergravity coupled to two
anti-self-dual tensor multiplets in six dimensions. We show that an important
sub-sector of this theory has a consistent truncation to a particular gauged
supergravity in three dimensions. Our consistent truncation is closely related
to those recently laid out by Samtleben and Sarioglu (arXiv:1907.08413
[hep-th]), which enables us to develop complete uplift formulae from the
three-dimensional theory to six dimensions. We also find a new family of
multi-mode superstrata, indexed by two arbitrary holomorphic functions of one
complex variable, that live within our consistent truncation and use this
family to provide extensive tests of our consistent truncation. We discuss some
of the future applications of having an intrinsically three-dimensional
formulation of a significant class of microstate geometries.
