The environmental suits associated with the 1899 space voyage for the movie First Man on the Moon demonstrate a limited knowledge of the environmental conditions of space and the moon, however there is a greater adherence to certain basic principles that were understood at the time such as lack of oxygen and a gravitational differentiation between the earth and the moon, that were completely disregarded in Aelita and Just Imagine. While the movie was released in 1964 just a five years prior to the actual landing on the moon, the original story is taken from the H. G. Wells novel written in 1901. Therefore the costuming for the spacesuit is associated with the available technologies of the turn of the century, in this case a modified version of a deep-sea diving suit or "back pack" underwater suit and "re-breather" breathing apparatus. The lack of oxygen in space and on the moon is associated with the familiar lack of oxygen underwater. The use of a diving suit makes perfect sense, what keeps water out, would inevitably keep air in. In addition the relative discontinuity of the exposed hands of the space travelers to a zero pressure and extremely cold environment of space, relative to their protected bodies in understandable, as the likened exposure of human skin to water is not an issue.

The act of breathing on the moon is addressed in the movie however there is not a complete adherence to the notion of zero atmosphere, pressure and oxygen. The characters must use oxygen tanks and helmets on the surface of the moon, however once inside the moon itself, they are able to remove the helmets, perhaps due to an artificially created atmosphere by the lunar inhabitants. Similarly the characters are able to communicate with each other by placing their helmets together. This would not function in reality as the lack of atmosphere on the moon prevents the travel of sound. What the film does address is the reduced gravity on the moon. The characters wear weights in their spacesuits to counteract the effects and we are shown the relative ease with which they are able to bounce around the moon in a similar fashion to Neil Armstrong in 1969.