Nirmala Sitharaman donned special suit before flying in Sukhoi-30, Know what is G-suit. Union Defence Minister Nirmala Sitharaman donned a special G-suit while she undertook sortie in IAF's Sukhoi-30 MKI fighter jet on Wednesday. The Defence Minister took stock of operational preparedness and combat capabilities of the IAF. A g-suit, or the more accurately named anti-g suit, is a flight suit worn by aviators and astronauts who are subject to high levels of acceleration force also know as G force. Watch this video to know what is a G- suit.