OH! I'm so envious that you are making your own corsets. I bought the stuff to sew my own bras, but have been too timid to start them yet.
Little soap bags are a great idea! You can put all the little oddments of soap in it, and use it to wash with. Love that idea! cotton waffle stitch would be great for that too.
My family knows better than to ask me to knit/spin/sew for them now. After I went to my SIL's home and found the hand knit afghan I made for them in the dog's basket, I quickly took it back and said never to expect anything else ever. And I mean it. How disrespectful of someone's labor can you get?
When I feel there is a need for something, I will knit for my bro & niece. But the SIL can expect never to have a single hand made thing again.
Good luck! Hope your family is more grateful than mine is!