Monk and Swordsage both get the class feature AC Bonus (Ex).
Monk:
When unarmored and unencumbered, the monk adds her Wisdom bonus
(if any) to her AC. In addition, a monk gains a +1 bonus to AC at 5th
level. This bonus increases by 1 for every five monk levels thereafter
(+2 at 10th, +3 at 15th, and +4 at 20th level).
PHB, p. 40
Swordsage (ToB, p. 16):
Starting at 2nd level you can add your Wisdom modifier as a
bonus to Armor Class, so long as you wear light armor, are
unencumbered, and do not use a shield.
Do these bonuses stack?
Best Answer
Nope.
Strictly speaking, the Swordsage ability only works in light armor, and the Monk ability only works when he's in no armor at all.
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