I have a fairly small wardrobe area in the bedroom so keep other seasons in the loft. I switch these twice a year and use it to have a sort of and rethink. I've not done it yet for the autumn Winter so these are my thoughts for when I do it.
Keep fairly seasonless items like tailored trousers, shirts, blouses and mid weight tops in the wardrobe.
Remove lightweight summer trousers, linen and cotton jackets and sandals.
Think about short sleeved items and perhaps store in airing cupboard rather than in loft.
Bring down all the winter things and check them against the new ' sophisticated ' colour fan. Try things on and put to one side anything which is slightly too small. If too small and wrong colour then donate. If fits ok but wrong colour but could be dyed then dye. If wrong colour and can't be dyed then donate.
Use leather dye on shoes ( and possibly belts, bags etc) which are wrong colour, for example mid warm brown shoes to dark brown etc.
Spend some time making work suitable outfits. Check tights and see if need to buy any extra colours.
Polish shoes and boots. Spray suede boots with protective spray.
Coats - get out all the coats and jackets and check them against the colour fan. Wash and re waterproof the navy coat with hood. May need to keep bad colour coats until they can be replaced to avoid being too cold!!! Sadly the red coat is probably too bright now but perhaps keep until can replace in sales. Dark Brown wool coat is good colour but very worn. Could it be refreshed with a fur collar and cuffs? Check in fabric resources for something suitable.
Check through the various activities I do and make sure I have suitable coats for all of them. Note where anything is needed and add to wardrobe holes list.
Check gloves and hats. Donate anything not in colour palette and note where need to buy new. Throw away any gloves with holes as no one will want them :-(
Check through handbags and compare to swatches. Donate anything which doesn't work. Decide on a good storage location for all the bags where they are easy to access.
May be worth buying some new short wellies as the old ones perished last year.
Take donations to charity shop.
Organise wardrobe and drawers so it's easy to find things.
Prep clothes for the week on a Sunday night to reduce stress in the mornings for work.