Selling my sister's wardrobe - A preamble

Years ago I discovered Marie Kondo's The Life-Changing Magic of Tidying Up. It was life-changing for me indeed, and that will be the topic of another post.

As part of going through the Konmari process of decluttering, I went through my clothes and discarded and donated bags and bags of them. Since that first pass, I've been focused on paring back my wardrobe until every piece I own is one that I love and wear regularly. I'm just about there, as now it's only every so often I remove a clothing item because it's no longer being worn, or it has worn out.

Meanwhile, a couple of friends of mine began decluttering their place to possibly make a move interstate. As part of their preparations, they gathered together all the clothes they wanted to discard and set off to sell them at a second hand clothes market. 
My sister and I went along, me to support my friends, my sister to check out what kind of new threads she could get cheaper than buying brand new. And of course, we went to spend a morning together shopping sustainably and generally having a nice time.

A month or so after this outing, my sister asked me to help her go through all her clothing with the idea we would have enough quality items to host our own clothes market stall. She's a fairly regular online shopper and was finding that plenty of new things were coming in and nothing older or unworn was going out.
Seeing the difference I had made in my own wardrobe, my sister was pretty confident I could help her declutter her clothes, and give the support and objective view on pieces that she wouldn't have doing it alone.

With the combination of my sister's unwanted items and the few items I still had to remove from my own wardrobe, we would have a range of sizes and brands that would hopefully bring a wide variety of shoppers to our stall.
​We would get to be creative together getting ready for the market, spend lots of time having fun, and maybe make a bit of money to boot.

So a plan was hatched.