I've been to lots and lots of retreats and I'd leave about half of that stuff at home. You most definitely don't need perfume, nail polish or nail polish remover. Unless of course you're using a retreat as a way to step out on your husband like one person did at a retreat. You can probably leave the toilet paper at home. They generally have that everywhere nowadays.
Chances are high you won't use an iron or ironing board that you bring either. Most spaces limit the number of irons that can be plugged in and the people putting on the retreat generally supply irons, ironing boards and large cutting mats. It's best to ask the retreat hostess if you should bring these things.
It works out really well to have each project ready to sew before you get there. Pack the supplies for each project with the project and you'll cut down on the amount of stuff you have to lug.