The meaning "shore" in Ety/386 should actually read "shoe", see VT/Errata and Lambengolmor/735. Compare also with Early Qenya hyapa (PE/13:41) and Gnomish habin (PE/11:47), both glossed as "shoe"
Noldorin
hab-
verb. to clothe
hab-
verb. to clothe
habad
noun. shoe
habad
noun. shoe
A word for “shoe” in The Etymologies of the late 1930s derived from primitive ᴹ✶skyapat- under the root ᴹ√SKYAP (Ety/SKYAP). In The Etymologies as published in The Lost Road, the gloss was “shore” (LR/386), but Vinyar Tengwar Errata confirmed the actual gloss was “shoe” (VTE for issue 46). The Old Noldorin form was ON. skhapa with the early loss of final *t*, but in modern Noldorin it seems the -d < -t was restored via the plural N. hebeid, which in Sindarin would be ✱hebaid since *ei* became *ai* in final syllables for Sindarin of the 1950s and 60s.
Conceptual Development: The Gnomish Lexicon of the 1910s had G. habin “shoe” derived from {ᴱ√sı̯ap >>} ᴱ√χı̯ap, appearing above G. habach “a big shoe, clog, sabot” of similar derivation (GL/47). Elsewhere in the document, Tolkien compared G. saib “boot” derived from ᴱ√SAYAP to (unglossed) hab (GL/66).
hamma-
verb. to clothe
The form hamnia- in the Etymologies is a misreading according to VT/45:21
hamma-
verb. to clothe, to clothe, *put on clothes, get dressed
A verb in The Etymologies of the 1930s glossed “clothe” and derived from the root ᴹ√KHAP “enfold” (Ety/KHAP), along with a variant N. hamma- of the same meaning (EtyAC/KHAP). In The Etymologies as published in The Lost Road, Christopher Tolkien gave the form of the second verb as hamnia- (LR/363), but Carl Hostetter and Patrick Wynne confirmed that the actual form was hamma- in their Addenda and Corrigenda to the Etymologies (VT45/21).
Conceptual Development: There was a verb of similar meaning in the Gnomish Lexicon of the 1910s: G. {baitha- >>} baidha- “to clothe” (GL/21). This was derived from the early root ᴱ√VAẎA “enfold, wind about” as suggested by Christopher Tolkien (LT1A/Vai; QL/100).
Neo-Sindarin: In The Etymologies, Tolkien made no distinction between N. hab- and N. hamma-, except that the latter seems to be the basis for (the gerund?) N. hammad “clothing”. For purposes of Neo-Sindarin, I would use hab- for any covering of cloth, but would use hamma- for the more specific act of putting on clothing or getting dressed.