When you are going to order a pillow online, the most important thing you can do is measure the size of your pillows. The largest standard is 2 squares (2-inches of your face) which should slip in between the the hour glass.
All pillow companies have the exact specifications of their pillows including the widths of the replacement foam, guidelines on how to fill it and even the type of foam (overlay vs. 1 layer).
If you want to reduce the price of your replacement pillows, you will want to have a size reference on hand. Some of them have removable covers so that you can take a pillow cover with you when you visit the pillow manufacturing plant.
Replacing this cover will not affect the dimensions of your pillow. The size of the pillow processing plant will vary depending on the size of your order.
If you have a printable dimension card from your old pillow and bringing that same size pillow to the pillow plant will normally end up being less than the price of an order twice the size.
So the best approach is to take the pillow with you when you go to order a replacement ‘face’ pillow and measure both of your old pillows.
Some places have foam bargains, so be sure to look for that during your search. Also if the pillow you are ordering is for children and teens, check for bedding bargains.
Some companies do have them made in the store. Otherwise, you can often find them made outside of the store. Many times, though, so their costs that have been reduced due to an order, make them difficult to find in the store. In this case, use the internet to obtain them.
If you are ordering a standard pillow, you do not want to cover the whole thing with padding. You will want to fully cover the pillow with fabric and some type of covering.
If you want to use your old pillow to create a slip cover you can take a pattern from your old pillow and use that to make the slip cover. Just add a dash of color.
You can cover the entire pillow with the slip cover. If you are on a tight budget, then use a cheap tablecloth.
Use extra fabric to make pocket sheets to cover the sides of the pillow that will show from the sides.
Reference:
https://www.picocleaners.com/blog/the-12-different-types-of-fabric/
https://www.cdc.gov/sleep/about_sleep/sleep_hygiene.html
https://sleepeducation.org/healthy-sleep/healthy-sleep-habits/
https://www.helpguide.org/articles/sleep/getting-better-sleep.htm