|Mathwei ap Niall|
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So much confusion and incorrect information here.
First, to answer your original you CAN pin the target with your hair but you won't be able to sneak attack them. Pinned is just a grappled condition so you would still need to use your standard action each round to maintain the grapple. This will prevent you from taking the attack action to sneak attack the target.
Now if you are asking if you can get sneak attack damage off of the Constrict power of the WHW that's a different question.
Second, the rules of sneak attack don't care whether the target is pinned or grappled, it only cares if the target is flanked or denied their dex bonus. As long as those either of those conditions are met you can get your sneak attack off.
Finally, please ignore the incorrect information on natural attacks and grappling provided by absolutegrndzer0, it's all wrong.
Natural attacks and iterative attacks interact poorly and with the grab rules for the WHW makes it even more complicated. Trying to use your hair and iteratives together would go like this.
A). Declare full attack with hair and iterative strikes.
B). Natural attack with hair at Bab+strength bonus -5 to hit (penalty for mixing natural and iterative attacks, applies ONLY to nat attacks).
If you hit the target you deal 1D3 + half your int mod in damage and make a free action combat maneuver check (also at -5) to grapple the target. If this succeeds the target gains the grappled condition.
C. You now get to make your iterative attacks against the targets AC -2 (grappled applies a -4 to dex which equals a -2 to AC). You do NOT get your sneak attack since the target is not denied his Dex bonus they only have a penalty to it.
End your turn.
D). Target gets to act and since he's not tied up he can either try to break/reverse the grapple, cast a spell/power or full attack you with a 1 handed weapon (he can't use a 2-hander since the grappled condition denies that option). end turn
E. Your turn, you now try to maintain the grapple (a standard action) and if the target didn't break it last round you get a +5 on your attempt to grapple. You also are no longer taking the -5 penalty to attack rolls since you are no longer mixing nat and iterative attacks.
Since the grapple maintain is a standard action you don't get any other standard actions this round (like attacking) but you can choose to pin the target.
F. Jumping ahead to after you've pinned the target you still need to maintain the grapple so you still can't get your sneak attack from your iterative attacks (you don't have the actions left to actually attack with them).