Because i have my bed higher than it's supposed to be(i have 2 box springs,the mattress and then a memory foam on top of that) It's also queen size,but i make my quilts for either king or even bigger.I keep laying the blocks out on the bed til i get the size i want/need.I like mine to fit more like a bedspread,so all the box springs are covered,then i also make my own bed skirts.Forgot to say that i also usually have at least 3 borders.Works for me!! HTH Kathi

Google how to make a circular skirt for a doll Kathi

Thanks for the suggestions. I would love to find bed skirts in thrift shops, and I could easily sew my own, however, I don't have time. We just found out last week we must move ASAP for my husband's job and we are going on vacation later this week for 2 weeks. We would cancel the vacation, but it's not easy to do as it involves air travel and dog sitting for a friend. So we are extremely crunched for time! Our house is going on the market the minute we are back from vacation. Thanks for the help!

Just tuck the bed skirt under the top mattress so that you can pull the trundle out. You don't have to tuck it all the way underneath - just a few inches to give you some clearance.