different between strawless vs strapless

English

straw +? -less

strawless (not comparable)

Without straw.
- 1921, Christopher Morley, Modern essays
  Then he deftly spat the cigarette into a strawless portion of the floor, where it glowed for a few seconds before it went out.

strap +? -less

strapless (not comparable)

Without a strap or straps; usually describing women's clothing without shoulder straps.

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