Type what you're looking for, then Google it. That's not a bullshit answer, it's the truth. I did it. I found the exact program you're looking for. I've been using for almost a year now. You also need to 'Decrapify' the sim3packs before you can use them. That requires another program, made by the same creator.

 The MATY moderators and contributers make tutorials with links on what to do in almost every modded/patched Sims 3 related scenario. All you need to do is search and follow instructions. What are you doing that makes you so busy that you can't type your issue and click on a search button? Why are there so many of you asking the same type of questions, and what justifies you to be a jerk about it? 

(I apologize moderators, if this is the wrong place to post this.)

I live in the Southern US and I don't see hairstyles like that on a normal basis. My sister occasionally teases her hair to get it to bump a little bit, but my hair is too thin to make them work right and teasing my hair causes too much damage.

i have the hair on the left in my game and it looks awful and i cant believe they are charging for that crap. the rest look just like giant wigs. lol

It looks to me like you're comparing apples and oranges.

In the first screencap, you're looking at the wrong BHAV.  You need to find the "Function - Init" BHAV.  Scroll down. 
I don't think I've ever found any object in the game that didn't have that BHAV; I just don't know what it looks like for the gypsy because I've never modded her.

In the second screencap, that doesn't look like an NPC at all.  If your proposed gypsy is still in CAS or just a regular sim that you haven't converted to an NPC yet, none of this is going to work.

Here's some screenshots with the two pay hairs from CAS with an EAxis sim (an adoptable child one who grew into a teen recently). Please pardon the darkness as these were shot with the in-game camera; I really need to download a screen-grabbing program (because screen-grabbing with shitty Windows is even darker).
{Snipped}

You can stop the reversion for an individual NPC using SimPE. In order to do this, open the character file ( ex. N001_User00071.package), and in the behavior function "Function - Init: behavior function", there is a line "NPC- Put NPC outfit on me". Bypass that command by redirecting the line that points to it the the line that "NPC- Put NPC outfit on me" points to. For example, if "NPC- Put NPC outfit on me" is line A and has 2/2 for its true/false targets, make the line that points to A point to line 2. This will make more sense when you are looking at the code. You could also do the redirect a little sooner if you want to be more efficient. The problem with this is the sheer number of NPC's in the game.

A sprit is spitting while stretching into sexual positions.

How do you not know that?!

I can't find the magic wand. It's not coming up in collections. I have ep up to BV.

It's probably breaking the sprit of the rule, but this isn't a contest. It's a challenge, so if you feel like breaking it we can't stop you.

Can I point and laugh anyway?