OK, question . . . what are those 2 roundish pieces on the top right of the UV Map? I would suggest cutting a seam through each, which will make them lay flat, and then would be easier to texture.
Another thing, though it's lying flat as is, I usually make the front and back separate pieces, so not only do I make side seams, I make shoulder seams as well.
As far as the layout of the pieces, I would make sure the pieces are all laying in the same direction. IOW, if you make separate pieces for the front and back, the shoulders on both should be up. The same would be true of the two panty pieces. Some textures can cause problems, if not flowing in the same direction on all pieces. Otherwise, you would have to rotate the texture over some pieces to make sure it's all flowing properly.