My low confidence score comes from the fact that I think that they are referring a fabric like Superfabric ™ which has "small, hard dots bonded to a base fabric." However, we don't typically refer to this type of dots on fabric as pills. We are more likely to say dots or balls. So I suggest that you verify any translation of this term with your client. Additional ideas for translation are also shown below.

English References:
Notes about Pilling
Pilling is the formation of little balls (pills) of fiber on the surface of the fabric, resulting from contact, abrasion, and wear. As fabric gets rubbed, short or broken cotton fibers are pulled away from the yarn and rise to the surface of the fabric and gather to form pills. The stronger polyester fibers tend to hold on to these pills, preventing them from shedding off. Pilling is most noticeable in areas that receive the highest wear and abrasion, such as inside the collar band, under arms, on cuffs, and where the seat harness rubs on the upper chest area. While pilling occurs unavoidably in all fabrics, it can be minimized with reasonable care and proper handling during laundering, as indicated above. Most important is to launder your shirts separately from other clothing. Usually the pilling appearance will actually subside as the pills finally shed off after repeated launderings. Also, hand-held clothes shavers, much like an electric razor, are available which shave the pills off the fabric .
http://www.pilotshirts.com/4_ShirtCare.asp

pill
–verb (used without object)
10. to form into small, pill-like balls, as the fuzz on a wool sweater.
http://dictionary.reference.com/search?q=pills

The instep is made from SuperFabric Brand fabric, which is a special tough-textured material that will withstand the rigors of the 3-inch "fast rope" deployment from helicopters without tearing the boot's seams. The SuperFabric consists of small hard dots bonded to a base fabric. It is highly water resistant, protective, flexible, cut, abrasion and scratch resistant fabric. The protection is provided by the tiny, hard guard plates (the dots) adhered to conventional and non-conventional base fabrics. The guard plates act as protective armour to the underlying fabrics while maintaining the intrinsic flexibility of the fabric.
http://www.militarymorons.com/equipment/footwear3.html

Performance elbow assembly with SuperFabric abrasion dots and lightweight flame-resistant foam elbow pads
http://www.massif.com/nomex_clothing/army_combat_shirt.php

Palms have a single layer of U.S. made SuperFabric brand material for cut resistance and coated with black silicone dots for extreme grip on inmates, equipment, and weaponry
http://www.leatherglovesonline.com/pages2/mp3a-dcrt300.htm?S...

French References:
Gants en cuir avec paume en SuperFabric® anti-coupures et enduite de points de silicone pour une préemption maximale. Coquilles en Carbon-Tek™ au dos de la main pour dévier les coups et objets contondants.
http://www.bwcorp.be/IMG/pdf/p50-2.pdf

Motif Silicone appliqué sur la paume pour une meilleure prise sur tout objet dur tel un bâton
http://www.estl.com/PDF/x3.pdf

Appliques en silicone sur les doigts pour une meilleure adhérence sur le levier de frein
http://www.mec.ca/Products/product_detail.jsp?FOLDER<>folder...

Matériel unique : EVA, TPR, EVA avec le tissu pointillé, éponge, couverture d'EVA avec le cuir synthétique,
http://french.alibaba.com/product-gs/cotton-velour-slipper-e...

Laine mérinos, fibre naturelle de haute performance
Apparue en pointillé dans les collections sport depuis plusieurs années, la laine mérinos fait valoir de nombreux atouts en matière de performance technique. Absence d’odeurs, facile à laver, douce au toucher, cette qualité de laine, qui est la plus fine du marché, devient une alternative crédible aux synthétiques.
http://sportpremiere.com/7-magazine/Tech-Style