i'll teach you how to unpack starbound's files and mod files

first, go to your starbound directory, either via steam's shortcut or in file explorer

the starbound directory is at Steam\steamapps\common\Starbound

then, open cmd inside that directory, or make a .bat file to run the command when you execute it

the command to do is:
THE "" ARE REQUIRED

this will take some time, and it will unpack the Starbound assets to a folder named UnpackedAssets

then, find a good dress and pants that would do for a good model

and just edit them!

then repack them into the mods folder and test if it looks good

to repack, do the command:
this will pack the assets in the folder "RepackAssets" into your mods folder