Suitable comes from Latin sequī meaning 'to follow' — something suitable follows or matches what is needed. The same root gives us suit, sequence, pursue, and consequence.
Right or appropriate for a particular person, purpose, or situation.
From Anglo-French sutable, from the verb suit meaning 'to follow, to match', from Old French sivre/suir meaning 'to follow', ultimately from Latin sequī meaning 'to follow'. The underlying idea is that something suitable 'follows' or matches a need — it falls into line with what is required. The Latin sequī produced an enormous family: sequence (things that follow one another), consequence (what follows from an action), pursue
Suitable, sequence, pursue, consequence, and even the number second all come from the same Latin verb sequī — 'to follow'. A suit of clothes was originally a matching set, garments that 'follow' the same design. A legal suit follows a complaint through court. Something suitable follows your requirements