I use a coverstitch to top stitch the seams.  There are 2 stretch stitches that sewing machines can have, the lightning bolt stitch (diagram looks like it sounds) and/or the triple stretch stitch (3 broken parallel vertical lines).  If the lightning bolt stitch does not give the look you require (the look varies on machines), try the triple stretch stitch.  This is the one Dani and Barbara use.  It is a nightmare to unpick though.  Coverstitch gives the best look.

Hi.   It looks like the neckline of the leotard could come up a bit higher before the collar is sewn on.  Also, it is best to cut the collar more to the neck measurement of the dancer and add the necessary amount for the join/overlap at the back, and then stretch it on to the leotard neckline and sew on.

You need to stitch it on to the top layer of net as close as you can to the lycra bodice.  Don't sew it to the lycra as the stitches will snap as soon as the lycra is stretched.  It's not an easy thing to sew on and I find a curved needle very useful.

Is this what you are after or any good?

https://funkifabrics.com/plain-fabrics/bodystocking-lining.html

If you do an image search with google, you will see quite a variation.  Some on the high hip, some at the waist and some with a dropped waist bodice. 

https://www.google.co.uk/search?q=kitri+costume&client=firefox-b&source=lnms&tbm=isch&sa=X&ved=0ahUKEwj8w93Rt-jSAhWsD8AKHU_hAf0Q_AUICCgB&biw=1696&bih=807#imgrc=_

Am I able to change my username?

Hi to all from another TSF Member since 2007.  Same name - lack of imagination!  The Other Half suggested, too late, that I should have used Seam Stress(ed).   

So lovely to see this forum spring up after the demise of TSF and to see so many familiar names.

I having been making tutus for far too long and other stretch dancewear and it is my full time job, hence my OH's witty suggestion for a forum name!  I have also been known to do a little teaching on the Tutus That Dance Seminars in the UK and have met many mad tutu ladies in the process.  They're a great bunch!

Great to be back!

Mainly look to use the 40 denier nets, but add a couple of extra stiff layers in (the 60 denier), possibly, from the top, layer 2 to support any decoration on top of the skirt, and layer 5 to support the hoop on layer 4.