I wear regular convertible tights in the summer so that I can wear flip flops after skating (since it's over 100F most days here in the summer). I've also never had a problem with it moving, being uncomfortable, or causing blisters. But that's just me.
Loops, the hole in the foot is only really big enough to put your foot through. Not sure it could be stretched over a boot (nor would you want to it stretch that much). It generally rests right under the ball of your foot when they're pulled over the foot. You probably could stitch it shut, but the seam might be uncomfortable. Not sure how that would feel in skates.