The correct thread for garment sewing?

I've recently started getting into making clothing for my girls, but am beginning to think it's not as straightforward as it seems.  As an example, I've been using the Guterman's 100% cotton thread I use for quilting and general sewing.  A few times, though,the seams have popped out of shirts after only a few wears and washes.  My seams have been the usual 1/2", so I don't think they're too skimpy or anything.  Should I be using some other stronger type of thread?  So far, I've also been using 100% cotton fabrics, too, so I thought the fabric and thread should match in fiber content...

I have used the Guterman thread without any problems but I'm probably just as likely to use Coats & Clark. I have not had any seams pop on any of the garments I've made.

I use Guterman thread as well, but the 100% polyester.  I think it's stronger.

I use Metrosene (polyester) for clothing and crafts, I only use cotton (Mettler or Aurafil) for piecing quilts.

I've been using coats & clark dual duty for clothes. No seams popping at all.

This is what I use and I don't have any problems.

You shouldn't have any problems with this thread. You might want to check your stitch length and make sure that you are sewing with a 2.5 to 3.0 stitch length. If you are sewing with a longer stitch length like a 4-5, that could be a reason your threads are popping.