Finding the perfect fit for your decorative pillows can be tricky. If you’re wondering what size pillow cover for 18×18 pillow you need, the simple answer is an 18×18 inch cover. However, that’s just the starting point for achieving the look you want, as the fit can vary from snug to relaxed.
This guide will explain everything you need to know about pillow cover sizing. We’ll cover how different fabrics behave, the difference between insert sizes and cover sizes, and how to choose the right style for your home. You’ll get clear, step-by-step advice to make sure your pillows look professionally styled every time.
What Size Pillow Cover For 18×18 Pillow
For an 18×18 inch pillow insert, you typically need an 18×18 inch pillow cover. This creates a standard, full look. But the real secret is that you can often use a slightly smaller or larger cover to change the pillow’s plumpness and style. A 17×17 inch cover will give you a very tight, firm look, while a 19×19 inch cover will result in a softer, more casual appearance.
It all depends on the “finish” you’re aiming for. Let’s break down the three common fits.
Understanding Pillow Cover Fit: Tight, Standard, and Loose
Pillow covers are not one-size-fits-all, even when they’re labeled the same size as your insert. The material and desired aesthetic play a huge role.
- Tight Fit (Cover Smaller than Insert): Using a 17×17 cover on an 18×18 insert. This requires stuffing the insert firmly into the cover. It creates a very plump, structured pillow with sharp edges. Best for stiff fabrics like linen or canvas that hold their shape well.
- Standard Fit (Cover Matches Insert): Using an 18×18 cover on an 18×18 insert. This is the most common and reliable approach. It gives a full, neat appearance that works for most decorative styles and fabrics, from cotton to velvet.
- Loose/Relaxed Fit (Cover Larger than Insert): Using a 19×19 cover on an 18×18 insert. This creates a soft, slouchy, and casual look. The pillow will have less defined corners and a more laid-back vibe. Ideal for knit covers, soft linens, or a cozy, informal setting.
The Critical Role of Pillow Insert Quality
Before you even choose a cover, look at your pillow insert. A cheap, flat insert will never look good, no matter the cover size. Always opt for an insert with a high fill power and good material.
- Material Matters: Down or down-alternative inserts are the best. They are moldable and can be fluffed to fill out a cover properly. Polyester fiberfill can work but may clump over time.
- Overfill is Key: For a luxurious look, many designers recommend using an insert that is 2 inches larger than the cover. For an 18×18 cover, they might use a 20×20 insert. This guarantees no sagging or empty corners.
- Check the Corners: Ensure your insert has well-defined, filled corners. This is crucial for getting that crisp, finished look in your cover.
Step-by-Step: Measuring and Choosing Your Cover
Follow these steps to ensure you get the perfect cover everytime.
- Measure Your Insert Accurately: Lay the insert flat. Use a tape measure to check both the width and height. Don’t just assume it’s 18×18; sometimes they can vary slightly due to compression.
- Decide on Your Desired Look: Do you want a formal, plump pillow for your sofa? Go for a tight or standard fit. Aiming for a cozy, bed-friendly pillow? A loose fit might be better.
- Consider the Fabric: Stiff fabrics have less give, so you’ll likely need a cover size closer to the insert size. Stretchy fabrics (like some knits or spandex blends) can accommodate a tighter fit more easily.
- Read Product Descriptions Carefully: When shopping online, look for notes from the seller. Some brands specify if their covers run small, large, or true to size. Check the care instructions too, as some fabrics may shrink.
What About Envelope Closure vs. Zipper?
The type of closure can affect how easy it is to get the right fit. A zipper closure allows you to fully open the cover, making it simpler to insert a plump pillow. An envelope closure has an overlapping flap in the back, which can be slightly more challenging with an overstuffed pillow but offers a seamless look from the front.
Common Fabrics and How They Fit
Different materials behave differently. Here’s a quick guide:
- Cotton & Linen: These natural fibers have little stretch. They work best with a standard or slightly loose fit. They may shrink a bit on the first wash, so pre-washing or sizing up is a good idea.
- Velvet: Provides a luxurious, structured look. A standard fit is ideal to showcase the fabric’s richness without it pulling too tightly.
- Knit or Chenille: These have more give and drape. You can often use a standard or loose fit to enhance their cozy, soft character.
- Performance Fabrics (e.g., Sunbrella): Designed for durability, they often have less stretch. Stick to the standard sizing recommendations for these.
Troubleshooting Pillow Cover Problems
Even with planning, you might encounter some issues. Here’s how to fix them.
Problem: The Cover Looks Too Loose and Saggy
Solution: Your cover is too big or your insert has deflated. Try using a larger, plumper insert (like a 20×20 in an 18×18 cover). If the insert is good, you may need a smaller cover size for a tighter fit.
Problem: The Cover is Too Tight and Won’t Close
Solution: The cover is too small or the insert is overfilled. First, try compressing the insert by rolling it or pressing it down before inserting. If it still won’t close, you need a larger cover size. A cover with a zipper might also be easier to manage than an envelope closure in this case.
Problem: The Corners Are Empty or Bunchy
Solution: This is usually an insert issue. Before placing it in the cover, vigorously fluff the insert and manually push filling into each corner. You can also gently massage the corners of the covered pillow to distribute the filling evenly after it’s inside.
Custom Covers and Shrinkage Considerations
If you’re sewing your own cover or buying from a small artisan, communication is key. Always specify the finished size you want the cover to be after sewing and washing. Most cotton and linen fabrics shrink between 3-5% on the first wash.
To account for shrinkage when making an 18×18 cover:
- Pre-wash and dry your fabric before cutting and sewing.
- If you can’t pre-wash, add about 1 inch to your cut dimensions (so cut fabric for a 19×19 finished cover to end up near 18×18 after washing).
FAQs: Your Pillow Cover Questions Answered
Q: Can I use a 16×16 cover on an 18×18 pillow?
A: It’s not recommended. A 2-inch difference is usually too much. The cover will be extremely overstretched, the seams may stress, and it will be very difficult to close. The fabric could also tear over time.
Q: What size cover for an 18×18 pillow if I want it extra plump?
A: For an extra plump look, use an 18×18 cover with a 20×20 insert. This is a standard designer trick. The larger insert compressed into the smaller cover creates lasting fullness.
Q: My 18×18 pillow cover shrank in the wash. What can I do?
A> First, try stretching it gently while it’s still slightly damp. If that doesn’t work, your only options are to use a smaller insert (like a 17×17) or repurpose the cover for a smaller project. Always check care labels and consider pre-washing fabric.
Q: Are there standard sizes for pillow covers?
A: Yes, common standard sizes include 12×12, 16×16, 18×18, 20×20, and 22×22 inches. However, many brands also offer in-between sizes. Always measure and read descriptions rather than relying solely on the labeled size.
Q: How do I get my pillow covers to look as full as the ones in magazines?
A: The secret is almost always overfilling. Use a down or down-alternative insert that is 2 to 4 inches larger than the cover. Before styling, give each pillow a good fluff and punch to plump up the corners. Rotate and fluff them regularly to maintain the shape.
Final Tips for Perfect Pillows
Remember, the labeled size is just a guide. The best way to know is to understand the relationship between insert size, cover size, and fabric. When in doubt, order a standard 18×18 cover for your 18×18 insert—it’s the safest bet.
For a more custom look, don’t be afraid to experiment with sizing up or down by one inch. Keep your pillow inserts high-quality and well-fluffed. With these tips, you can confidently choose the right cover and achieve a beautifully styled home that feels comfortable and inviting. The right pillow can completly change the feel of a room, so taking the time to get the fit right is worth it.