maybe I'm just totally oblivious but despite looking through everything I can, I cannot find the till for my custom wearables shop? The CSC didn't shop up in my regular shop till either and I'm just going nuts looking for it! Where do I find the till for my CW shop?

There is no till for CW shops. Any CSC you earn from selling an item just gets added to your on-hand CSC

Weird, I got an event telling me I'd sold it and it hasn't shown up :( I wonder why... Thank you, though!

Is your item set at a price that would give you a profit? The minimum price listed on the item management page is the base price to cover the item, so you would have to set the price to something above the minimum in order to get CSC from selling it.

For example, my has a minimum of 200 CSC so I set the price to 250 CSC, and if it sells then I would receive 50 CSC

Oh Okay that makes sense! I had it set at the minimum [facepalm]