i have only been to Primark but as said not within the last year, their choice is amazing. i confess i go to the mens department for t shirts, joggers, which cost 5 quid the last time i bought some and still look ok. the ones i bought from cotton traders on line, cost 20 quid a pair and have lost their shape already....
A lot of these people probably can't afford to stand out from the crowd. Also children grow so quickly, it's a cheap way of keeping them in decent clothes. My daughter shops at Primark for my grandsons for everyday clothes ( though she wouldnt queue like that), if trousers get ripped in the woods or covered in mud, who cares?