My favourite go-to place for hair is Anubis Under the Sun. Anubis takes hairs from some of the best creators, including Nouk, Peggy, Anto, NewSea and TumTum and retextures them so that they look great. Anubis has good taste and most of the hairs s/he chooses to retexture are ones you would actually want in your game (except when s/he gets a request for something weird). About 75% of the custom hair my sims wear can be downloaded from her site as well, which is handy for those seeking the barnets of my simmies when you’ve downloaded them.
S/he also does some outfits and accessories from time to time, which are equally great – though sometimes s/he sticks stuff up over at MTS rather than the blog, so keep an eye on Anubis’s page there, too.