If you have long legs she recommends wearing a 'low to mid rise'.

她建议腿长的女士可以选择低腰或中腰的牛仔裤。 。

youdao

With a tandem jump you sign a release form, put on a jumpsuit and are quickly shown what to do once you leave the plane: how to cross your arms and bend your legs while in mid-air.

BBC: Falling into New Zealand, from 10,000 feet