The list below comprises of some of the most common brands used for relabelling, whilst most will require you to deal through a wholesaler ( see Wholesale Garment Suppliers ) some deal direct, the website are never the less useful as a source of information on garment sizing & specifications.
Gildan Clothing www.mygildan.eu
Fruit of the Loom www.fruitoftheloom.co.uk
Starworld www.starworldonline.com (Also supply direct in smaller quantities)
Russell Group www.russelleurope.com
Continental Clothing www.continentalclothing.com (Also supply direct in smaller quantities)