Following yesterday's big update, a couple of issues popped up - and we've now fixed them:
Lag, especially in the wardrobe, should be almost completely gone. The first time you open it, it may still take a little while to load depending on how many items you have. After that, everything should be nice and fast.
We've taken another pass at how layers work, both while sewing and in the Layers tab in general. Finding the right balance between "intuitive and easy to understand," "lets you do whatever you want," and "doesn't cause ridiculous glitches" isn't exactly easy, but we think this new version is a pretty good compromise.
The system is now closer to how it worked before, while making it much clearer whether you're working with the garment you're currently sewing or the clothes already worn by the model.
Enjoy the game!