Something seamless could literally be a piece of clothing without seams, but it's usually something else that's smooth or unbroken, like a seamless transition.

Seamless things are connected so well that you can't see what's holding them together. They're flowing, consistent, and well-put-together. If an employee leaves, and the replacement does a great job immediately, that's a seamless transition. In basketball, if a team goes from offense to defense without missing a beat, that's seamless play. And that underwear that seems to be made out of one piece of material? Seamless. And super comfortable.

Definitions of seamless
  1. adjective
    not having or joined by a seam or seams
    seamless stockings”
    (of rugs or carpets) woven full width
    knitted in tubular form
    having no seams
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    having or joined by a seam or seams
    showing a seam
    sewed, sewn, stitched
    fastened with stitches
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  2. adjective
    perfectly consistent and coherent
    “the novel's seamless plot”
    coherent, consistent, logical, ordered
    marked by an orderly, logical, and aesthetically consistent relation of parts
  3. adjective
    smooth, especially of skin
    synonyms: unlined, unseamed
    having a surface free from roughness or bumps or ridges or irregularities
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