Yes, that's the case I think.
To install both of them (by using
JSGME...JoneSoftGenericModEnabler, recommended!) you have to:
- first extract the entire
Elite Uboat Crew Uniforms-mod into a temporary folder
- then open it, and cut
The Captain Uniform.rar from it
- paste this on your desktop for now
- go back to that temp.folder, and cut&paste
Elite Uboat Crew Uniforms into your SH3/MODS-folder
- now open
The Captain Uniform.rar that's on your desktop, and extract the content into your SH3/MODS-folder
- now both mods are ready to be enabled by JSGME
- after that's done, you can delete the temp.folder and the rar-file on your desktop