M&S Collection 2pk Non Wired Crop Top First Bras. M&S Collection Bras: simple and supportive bras specially designed for pre-teens. “EX M&S (over-runs, end-lines, cancellations). 55% polyester, 42% cotton and 3% elastane (exclusive of trimmings) 57% polyester, 40% cotton and 3% elastane.