a measure tape or a big ruler
The standard measure for a single bed in Britain, Australia, NZ is 36 x 75 inches. In USA the standard is slightly wider at 39 x 75 inches.
That's the standard double bed width in the UK. Anything bigger has a fancy name and you would do well to measure the dimensions.
Flannel sheets for a king size bed measure 76 inches wide by 80 inches long. These measurements are for a standard king size bed. A California king size bed measures 108 inches wide by 102 inches wide.
Underwear
A bed skirt is decorative but originally was made to help eliminate the collection of dust under the bed. Many comforter sets include a matching skirt.
It is not necessary to change the bed skirt at the same time as the sheets because your not sleeping on it. Wash the bed skirt when it looks like it is dusty or not clean.
After doing some research there is no difference between a dust ruffle and a bed skirt. Both are used for decorating the bed. By placing the dust ruffle or bed skirt on the top of the box spring but under the mattress.
A bed skirt is more of a decorative item. If your duvet covers your box spring it probably isn't necessary but if you like for not to be exposed definitely purchase a bed skirt
depends
The bedding set that come with a bed skirt is the Room Magic Tropical Seas Twin Comforter or the Sham Set
dust ruffle
Dimensions of a king size bed are; 76" wide by 80" long Dimensions of a California King bed are; 72" wide by 84" long You could fit it but it would not look as nice as the proper size of bed skirt would
How much fabric is needed to make a twin size bed skirt depends on the type of skirt that you want. You will need four yards of fabric for a tailored skirt. You will need six yards of fabric for a boxed pleated skirt, and you will need eight yards of fabric for a shirred skirt.
Stitch it by hand, or use tape to attach a skirt of fabric to the box springs on your bed. Another idea would be to purchase enough fabric to simply cover the entire box springs and hang over the edges far enough to skirt it. This would work well with a double or Queen Bed, using king bed sheeting.
febreeze
How much fabric do i need to make a queen sized ruffled bed skirt/ You have to measure your bed . measure your box spring from the head of the bed to the foot of the bed and multiply that by 2. Then measure the width of you bed add both numbers together then mutliply by 2.5. that should give you how many yards of fabric you need. then you want to measure from the top of the box spring to the floor or how ever long you want the bedskirt to hang and you want to add two inches to allow for hemming and attaching the ruffle to the flat material that goes between the mattress and box spring this measurement should tell you how wide your material should be. most material comes in 45 in or 60 so you should be good either way