I seem to suffer from the same condition, Cake.
Won't buy 'slogan' tops for M, or cartoon characters and spend a huge amount of time avoiding pink. She seems to suit red, so I tend to go for that mostly!
Both fortunately and unfortunately, M is the first child for a generation on both sides of the family. So she gets a lot of clothes bought for her by well meaning relatives. Great because it saves my finances and she gets lovely new clothes, bad because they're often not my taste! M doesn't care, but I tend to swap bits round to put the character t-shirt under a dress or split the pink up with blues and greens.
It's sometimes a bit hit and miss, but some of my favourite clothes for M have come from Matalan. They tend to be relatively hard wearing, as well as quite cheap! I get quite a few things from H&M too, normally separates for matching in like plain tops or leggings. Tesco and Boots have some nice things especially when bought with points/vouchers.
I love the clothes in Gap and Monsoon for children, but I can't afford them without remortgaging! If I see a sale though I tend to pop in and have found a few bargains. I might have to go visit the outlet at Junction 32 before summer. 
Barely spend anything on clothes for me... I have two sets of work clothes that I alternate, and in the evenings/weekends I have three pairs of jeans and a lot of t-shirts that get rotated. I'm very dull and a fashion disaster.
I have some nicer clothes, but they're in the next size down and I can't fit in them at the moment. Until life and my diet get sorted, I'm unlikely to! But I won't let myself buy any new clothes at the larger size.