If you are unable to find anti-static trouser petticoats, you could try making your own using silk organza. I make my own trousers and always line them with silk organza. No cling and they hang so well. You can buy silk organza on Ebay in a variety of colours - but it must be pure silk, not an artificial silk. Use a simple elastic waisted pyjama pattern to wear them under your trousers, rather than trying to line a ready made garment. Silk is so light and cool that it won't feel bulky or hot. Hope this helps. BTW I love the sound of your outfit.