Untucking these pants?

[Sydlet]

I found these bottoms WAY before I got the sims. =P What can I say, I was excited. But now that I actually have had them for awhile, I'd like to know how I could possibly make it so that they don't eat my untuckable shirts, like so:

http://img87.imageshack.us/img87/3222/21451953.png

Anyway, got them from this thread, (http://www.digitalperversion.net/gardenofshadows/index.php?topic=11263.0).
Someone told me I had to remesh it, but I don't think it requires that much work. I could be wrong. All I need is for the shirts to go over the pants.

[Phaenoh]

Pretty sure that the 'untuckable' trait is something that you do with the alpha, and that's under Bodyshop Recoloring, so I'll send you in that direction. The nice people over there should be able to help you. Good luck!

[isa_love_anime]

Yeah, I think you have to change the alpha... And then modify the texture, so it matches the "new" waist line you defined ^^

[CatOfEvilGenius]

You do indeed need to change the alpha. There is a white parts and a black part. The white part is where your texture is opaque. The black parts is where your texture is transparent. You'll want your texture to be transparent at the waist, so you'll need to black be lower, move it down towards the hips.

http://stonegod.org/sims2/tmp/em/alphaExample.jpg