Kitschy
Is In the Starlight a decent quality brand? I was shown some of their dresses and I'm thinking of ordering from them when they reopen.
They have good quality, yes.
smile I don't know about how they will be once they reopen but they've improved a lot of their designs and quality over the years. Their best item, though, has always been their petticoats.
Other than ITS, there's also
FanPlusFriend (based in Hong Kong), who is a little more questionable with certain designs as they also sell cosplay and there has been trouble with their standard sizing. If you order from F+F, always always take advantage of their free custom sizing to have things made to your measurements.
Anna House is a brand based in Hong Kong (prices are in HKD, not USD, so don't freak. It's actually really cheap) that's also very good, and they also offer the ability to do some customization.
Candy Violet is another American brand like ITS, but most people seem to shrug at them for anything other than their printed casual shirts or if you need a REALLY fluffy petticoat (great for super heavy fabrics). Not a bad brand, but they're not viewed as anything spectacular-- mostly because of their pricing. For only a little more, most people prefer the more creative designs from Japanese brand labels.
You're always going to get what you pay for-- so going with cheaper alternatives won't be the same quality as what you might purchase from a -good- Japanese brand (or certain seamstresses based in America even), but it's all still pretty nice.