Hello
I'm in the same search as I play skirmish games mostly in the period you mention. I would recommand Front Rank for eighteenth century Europeans but as humans are varying much in height and shape, you could add any other figures from Crann Tara to Galloping Major (militiamen).
For the seventeenth century, costumes may be mixed from Thirty years war to say Grand Alliance and indeed later for peasants or poor colonial people. The wealthy dress more according to each period main design. North Star has nice middle century civilians, upper brand ( protestant clergy, nobleman, two ladies). English civil war ranges provide some useful figures, for the Puritans for instance, and suitable villagers.
The several Renaissance ranges at The Assault Group offer some very useful civilian miniatures for the second half of the Sixteenth century (to play roughly the Sea Dogs period). For earlier times (the Conquistadores and the early French-English intrusions) you must see Warlord Games' marvelous Pike and Shot Landsknecht civilian range!
Hope that completed a little other comments.
Philippe