Women stay big, but get restrained...

You decide that a fun twist for it all would be for the women to stay tall and strong as they are now, but not be able to use it. You change society's norms going way back, to make it so that women are seen as to powerful for anyone's good, and therefore must be restrained. This included gags and blindfolds, no one knows why but the women don't seem to complain through them so its fine.

You blink, and Sarahs arms are suddenly held crossed in front of her in a leather straitjacket, and her ankles are cuffed with a short chain between them. Around her neck she's wearing a large ballgag, and judging by the saliva on it someone only just unbuckled it. "So anyway James, what I wanted to say was…"

Before she can finish that sentence you decide to make her your girlfriend, and make it so that women in relationships have to be "heavily restrained" for their mans safety. Sarahs straitjacket becomes a proper "jacket" made of thick canvas and her legs are held together by a leather hobble skirt. The ballgag around her neck is now strapped into her mouth, and held there by a proper head harness. Around her neck is a thick leather collar, with a leash going to your hand.
You tug the leash, and Sarah obediently wobbles closer, then drops to her knees with a thud. You pet her head, making her mumble something through her gag. "Silly girlfriend, you know I can't understand you through the gag." Sarah rolls her eyes.

You get up and decide to explore this new world, you want to see what the other girls at school now looks like. You remove Sarahs hobble skirt and replace them with several sturdy cuffs linked with chains. She still can't run to save her life, but at least she can now keep up with you. Now, off too...