selves

Here the plural splits by meaning. When self names a person, a personality, or a mind turned back on itself, the plural is selves: our younger selves, their public and private selves. The gardener's self, a seedling raised by self-pollination, takes the regular plural selfs instead. So selves belongs to people, following the -f to -ves pattern of leaf and leaves, shelf and shelves.

An old spelling of the singular meets the modern plural here. Selfe, now obsolete, was simply self written another way, so its plural looks exactly like today's. A reader who meets selves in an older text needs no translation and can read it as the familiar word. Only the noun selfe takes this plural, and the split between selves and selfs belongs to the modern plural.