Below you can see the front-view size comparison of the Olympus TG-3 and Fujifilm X-T1 IR. The Olympus TG-3 is clearly the smaller of the two cameras. Its body is 17mm narrower, 24 mm shorter and 16 mm thinner than the Fujifilm X-T1 IR.
The chart below depicts how two cameras compare with average dimensions of the cameras in their class.