It’s always fun following a word’s progression through the language. Take the Latin sequi, secut-, from which many things follow — sequels, things sequential, and those consecutive, from com, “together,” and sequi, “follow”. This not only created real consequences, things following (with them); but also made them consequential.
Sequi, “to attend” or “follow” mutated into the Old French suitte, “attendance” or “act of following.” As a sout, it was “attendance at court,” making for the syutor (1290), a frequent visitor there, later a suter, an “adherent” or “follower” and the suitor (1586) who courts or follows after a woman. From the livery or uniform worn there came a set of clothes worn together, our first suits (1400). Making them suitable (1577) “agreeable” or “convenient,” was their appropriateness to the occasion. Other things suitable included a suit of cards and a grouping of rooms following in close proximity, the suite. Following things legally into the courts made for both legal suits and the right to sue via the Old French suer from the same sequere. The lack of any real follow-up ends with a logical fallacy, a non sequitur, “It does not follow.”