So it makes sense from a sustainability point of view to divert clothes out of the waste stream, so basically to buy second hand, from charity shops first (it has already been given away) and then also in car boot sales, flea markets and 2nd hand and vintage shores or online market places, as well as also participating in clothes swaps.
This proves to be a further stumbling block on the quest for a perfect wardrobe as you don't have the same choice as you would if you were buying new, so while you may have a versatile garment in mind e.g. a black cardigan that can take you from formal to slouchy, you may have to get two to items (a blazer and a hoodie) to tide you over until you find the perfect cardigan.
While you can keep looking for the best quality stuff you can find, most of the things that people are donating are on the lower end of the scale, so again you will have to grab some of these to keep you going.
The same goes for the materials...you can't be picky about what your clothes are made of-obviously if a material is itchy or sweaty and would result in you not wearing the garment you should steer clear of that, but holding out for organic cotton and hemp clothes is not an option, so in the mean time temporarily keep some synthetics out of land fill.
What I am trying to say is you get a free pass on 2nd hand stuff, your wardrobe might not be as small and coordinated or as good quality or biodegradable as you would like ...but you are diverting garments out of the waste stream!