The chest and arms on the Smelter suit have some issues. The arms, particularly around the shoulders, are far too small to line up properly with their placement on the torso. This is most apparent when aiming, but even when idle the arms on this suit look disproportionately small, as though the Operator's arms are being stretched out with zero modification (they weren't, but the difference is minimal: https://i.imgur.com/epkNZ2R.mp4 ):
Video: https://i.imgur.com/j9SHG9P.mp4
As for the chest, the armor plating (which is clearly meant to be rigid) flexes with both the Drifter's shoulders and head. The former may be a compromise but the latter is clearly not intended.
Chest Flex: https://i.imgur.com/ZFdTkbr.mp4
Neck Flex: https://i.imgur.com/FRjVaVO.mp4
In addition to these issues the helmet does not properly hide the Drifter's hair while it's toggled open, like it's intended to on the Operator: https://i.imgur.com/Qxoks3I.mp4