sims 3 version would be fantastic
There’s a p. good tutorial here that tells you how to convert “female” clothes for “male” sims.
I don’t play the sims 3 (though I do own it) so I’ve not tested this, but other people seem to find it works fine. Sadly I know of nothing that lets you do the reverse.
I’ve made one dress so far (for maab teens)
SNEAK PEAK AW YEAR
… and twenty eight recolours of that one dress.
I’m going to limit myself to four from now on.