A Six-Step Fabric Checklist: Lycra® Body Suits, Lycra Lining, Mango Fiber, Pearlcomm Fiber, and Bath Towel Lines

This is the checklist I use when an apparel brand calls with a tight deadline and a fabric question. It is written for teams that need to source fabrics for Lycra body suits, Lycra lining, swimwear, and any product where Lycra fiber or elastane is part of the equation. I am also including two specialty fiber names that keep showing up in sourcing searches, mango fiber and pearlcomm fiber, and the bath towel line question, because inspecting textiles is not always about stretch.

In my role coordinating fabric sourcing for garment manufacturers, I have handled more rush orders than I can count without checking my notes. In one recent case, I remember a Lycra body suit program that had to be cut in 36 hours, and the fabric still had to be checked. The way I see it, a clear checklist saves you from panic decisions that end up costing more than the original rush.

Work through these six checks. When you cannot complete a check, that is itself an answer.

Step 1: Verify the Lycra claim before you verify the price

When I first started sourcing stretch fabric, I assumed any listing that said “lycra” was using the real thing. That is wrong. Lycra is a brand of elastane, not the generic name for it. Elastane is the generic fiber category; spandex is the common North American term; Lycra fiber is a branded elastane product from The Lycra Company. If you plan to label a product as containing Lycra fiber, the fiber should be traceable. You need supplier records, license status if the brand program requires it, or something that shows the branded fiber was actually used in the fabric.

Here is the thing: if a mill cannot tell you whether their stretch fabric uses Lycra fiber or generic elastane, the fabric might still perform fine. But your product claim is different. I would not put a Lycra trademark on a product unless I had the paperwork to back it up.

At minimum, ask these three questions: Is the elastane made with Lycra fiber or is it generic elastane? If it is Lycra fiber, can you show a fiber supplier record? And is the yarn bare elastane, covered elastane, or core spun? The answer changes how the fabric will feel and how it should be sewn.

Step 2: For Lycra body suits, define stretch as recovery after repeated wear

I used to think Lycra body suit fabric was mostly about elastane percentage. That was a rookie mistake. A fabric with a high stretch percentage can still become baggy if the knit structure is wrong or if the elastane was not heat-set properly. A body suit may be pulled over the shoulders, stretched across the torso, and released many times in a single day. If the fabric does not return close to its original dimensions, you end up with sagging at the thighs, shoulders or waist.

So do not accept “four-way stretch” as a specification. Ask for recovery data, not just elongation data. Take a sample, measure a 20 cm by 20 cm square, stretch it to the point your garment pattern needs, hold it for thirty seconds, release it, then measure again. If it has grown by a noticeable amount, it will probably grow in wear too. For close-fitting styles, I want to see less than 3 percent growth after that test, and even less after laundering. If you have fit data for your own garment, set your own tolerance before the mill starts sampling.

Put another way: it is better to reject a fabric during sampling than to explain to a retailer why 500 Lycra body suits no longer fit after the first wash.

Step 3: When someone says Lycra lining, think assembly first

Some product descriptions use “Lycra lining” loosely. A lining containing Lycra fiber is not a single product; it is a lining fabric with elastane, usually a knit tricot, stretch satin or lightweight warp knit. What matters more than the market name is whether the lining moves with the outer shell.

If your shell has stretch and your lining does not, the lining can restrict the garment and pull seams. If your lining stretches freely but never returns, the lining can bubble inside the garment after washing. I have seen both happen.

One mistake I made early in my career was choosing a Lycra lining by hand feel alone. It felt smooth and looked expensive. On the first fit sample, the seam slipped when the wearer pulled it overhead. I paid roughly $2,100 in extra cutting, fabrics and rush shipping to fix it. That is the kind of cost that does not appear on a fabric quote.

When you test a body suit, test the shell and lining as one assembly. Check seam slippage, seam strength, and how the layers look after laundering. If one layer recovers and the other does not, the problem will show up on the hips or under the arms, not on the fabric swatch.

Step 4: Mango fiber and pearlcomm fiber are marketing names until proven otherwise

Every few months I see a search for a material like mango fiber or pearlcomm fiber. Some of these names come from mills that use a brand name or a source description in place of the official fiber family. That creates a compliance risk.

Mango fiber is not an official generic fiber class. It might describe a plant-based or cellulosic material made from mango waste, or it might be a supplier nickname. If a mill offers mango fiber, ask for the actual generic class, the chemical or mechanical process used, and a document that says what it is. Otherwise you cannot write it on a label. Pearlcomm fiber follows the same rule. If the supplier cannot tell you whether it is polyester, nylon, polypropylene or something else, it is not a useful specification. It is a guess.

Do not let a nice sustainability story replace the technical data. A fabric can include Lycra fiber for stretch and another branded fiber for the face, but every component needs to be clearly described. A label that says “Lycra, pearlcomm fiber, nylon” does not mean much if the fiber family for pearlcomm is not shown.

I once spent an afternoon comparing two versions of a fabric with these kinds of specialty names and could not get a straight answer. In my opinion, that was the answer. If the mill does not know, move on before you pay for a lab test.

Step 5: Answering “What does the lines on a bath towel mean?”

Let us stop talking about stretch for a second. The lines on a bath towel are usually not a defect. They are usually part of the weave. Most towels are woven on terry looms with a ground warp and a pile warp. The visible line or band is often a dobby border, formed by changing the weave structure so that threads lie flatter instead of forming loops. If the line is in a different color, that is usually colored yarn woven in as a stripe, not ink printed on top of the towel.

You will see this most often near the ends of the towel. In hotels, colored woven lines are sometimes used to sort towel sizes in commercial laundry: a red line might mean bath towel, a blue line might mean hand towel. In consumer towels, though, the line is usually just a woven design element.

If the line runs along the long outer edge, that is normally the selvedge, which keeps the fabric from unraveling. And if a line seems to appear after washing, it may be a flattened area of terry loops from folding or drying under pressure. That can improve after the towel is washed and dried again.

So the practical answer to “what does the lines on a bath towel mean?” is that they are woven borders, stripes or selvedge details. They are not caused by fabric damage and they do not mean the towel is low quality.

Step 6: Run the total-cost number before you compare vendor prices

Now we get to the part that usually separates good sourcing decisions from bad ones. The total cost of a fabric is not the unit price on the quotation. It includes testing, compliance, logistics, re-cutting, rejections and end-customer returns. If a fabric has a vague fiber name or poor recovery, the savings can disappear quickly.

I remember one order where the cheaper body suit fabric saved about $0.18 per yard. After 1,200 units were sewn, roughly 9 percent had visible bagging. The replacement units plus the rush freight cost more than the fabric savings. That is why I now calculate total cost before comparing any quote. The same logic applies to Lycra lining, mango fiber, pearlcomm fiber, or anything else that arrives with a story attached.

The most common mistakes I see come down to treating “lycra” as a generic word, testing a body suit shell without the lining, trusting specialty names without data, and ignoring recovery. Avoid those four mistakes and the cost side usually sorts itself out.

The final check is simply this: if a supplier cannot answer a direct question about fiber content, fiber source, or expected performance, do not turn the order into an emergency. You are better off paying a little more for tested, documented fabric than paying twice later for guesses.