Yes, they are detachable.

It’s hard to say for sure without seeing them. I would just try out both and go with whichever looks best at the moment, but when you’re able to I would go ahead and get a blouse that would look better with the skirt.

If it’s a simple JSK and it doesn’t have any print or specific designs that would make it more appropriate for another style (for example if it has a Gothic cross print it would probably be better suited for Gothic, if it has a pastel cake print it’s probably better suited for Sweet, etc.) it could easily work for Classic. There are a number of colors of blouses you could use. Black would be one option but you could also do a number of dark, muted colors such as navy blue or wine red or you could use ivory for a more antique look and to lighten things up a little.

I think it actually looks surprisingly nice. I think it could work. The only thing I would personally do to it is maybe add something to the collar. A bow or a brooch or something that matches the coord, just because the neck looks a little plain.

I can’t think of or find any. My suggestions would be to make one if you’re good at sewing, have one commissioned, or buy a white blouse that you like and dye it purple.

I can’t exactly recommend one specific blouse because everyone is different and some styles might look better on different people, sizing is an issue for some people, budget is an issue for some people, and you haven’t really told me anything about yourself. I can however give you a few basic ideas of what to look for.

The first thing to think about is color. My biggest recommendation would be to start out with white for Sweet Lolita because white will look good with just about any pastel color and a good number of Sweet Lolita dresses have white somewhere be it in a print or lace or something. Even if your dress/skirt doesn’t have white in it though it’s still a pretty safe option.

One of the most versatile blouses you could possibly have for Sweet Lolita would look something like one of these:

White, as I said is probably the most versatile color for Sweet Lolita, then you have a Peter Pan collar which works well for the cute look the style has. They also have detachable sleeves so you can wear them with long or short sleeves and wear them year round, they also have ruffled hems so you can wear them tucked into a skirt or untucked. You can find similar blouses in a lot of places and there are also elements that you can swap out. For instance, if you happen to find that a Peter Pan collar might not look good on you, something with a higher collar or no collar at all can work just as well for you if you’re sure to keep the overall look Sweet.

Your best option will be to get something custom made from F+F, TaoBao, or another indie brand. For your custom color problem, you have to send them an email telling them that you want the custom color, when ordering you’ll just go with whatever the default is and then email them as soon as you get the confirmation message.

I think one of the first two blouses on the Surface Spell page would work perfectly with that coord. They’re both very different but I can see either one working and they’re priced a little lower than the Dear Celine blouses.

I think I like it best with a chiffon blouse because it gives it a very delicate look, but I think it could look okay with cotton blouses as well. I would just suggest staying away from anything very busy in that case, maybe a few ruffles and a bow at the neck, but nothing with tons of ruffles and lace or anything like that. You could also look at different colors, especially red and blue because they show up a lot in the print.  White would work as well though and obviously black.