  Given any two convex polyhedra P and Q, we prove as one of our main results
that the surface of P can be reshaped to a homothet of Q by a finite sequence
of "tailoring" steps. Each tailoring excises a digon surrounding a single
vertex and sutures the digon closed. One phrasing of this result is that, if Q
can be "sculpted" from P by a series of slices with planes, then Q can be
tailored from P. And there is a sense in which tailoring is finer than
sculpting in that P may be tailored to polyhedra that are not achievable by
sculpting P. It is an easy corollary that, if S is the surface of any convex
body, then any convex polyhedron P may be tailored to approximate a homothet of
S as closely as desired. So P can be "whittled" to e.g., a sphere S.
  Another main result achieves the same reshaping, but by excising more
complicated shapes we call "crests," still each enclosing one vertex. Reversing
either digon-tailoring or crest-tailoring leads to proofs that any Q inside P
can be enlarged to P by cutting Q and inserting and sealing surface patches.
  One surprising corollary of these results is that, for Q a subset of P, we
can cut-up Q into pieces and paste them non-overlapping onto an isometric
subset of P. This can be viewed as a form of "unfolding" Q onto P.
  All our proofs are constructive, and lead to polynomial-time algorithms.
