securing female clothing

Hi Everyone, I’ve been reading the site and forum on and off for a while but never posted, seeking some ideas. My fantasy involves spending an entire day locked in a french maid uniform with high heels, yet I tend to get too excited after about an hour. I have never managed even half a day dressed like this before. I own the maid outfit, various lingerie pieces, high heels, rope, chains and padlocks. Does anyone have suggestions on how I can secure myself into the uniform? Securing the heels is easy enough, but I’m struggling to find a way to keep the dress locked in place. Since it lacks a back zip, I cannot simply lock it to a collar. I’ve attempted wearing a corset over the dress and securing a waist chain across the corset, yet I can still undo the corset from the front. Any suggestions would be great - thanks.