My standard-issue synchro tights are a little short-waisted for me, so I could extend them with a replacement waistband. How long do you make the new waistband: the same width as the original waistband or do you stretch-gather it a bit smaller/larger? By 5cm finished width, the actual fabric is cut to 10cm and folded, correct?
I bought a "bodyslimmer" (like a bodysuit, not a body stocking) at a high-end department store about three years ago - it has a built-in underwire brassiere, so I don't have to fuss with undies. (Got to keep the bouncing in check.) I'll have to try out wearing it underneath the tights, that's an awesome idea! It would keep the bottom of the suit from showing, too, since it can be tucked and positioned up and out of sight. My bodyslimmer has hook fasteners in the crotch, so bathroom breaks wouldn't be any worse than having the tights underneath.
I hate to say it, but all my internet searches for "bodystocking" came up with adult lingerie sites. (Crotchless! Cross Dressing!) A search of Danny's Warehouse came up empty, as did Capezio's site. Is there another term that those are called?