I don’t know too much about Hijabs, but I’ll try my best !
There are actually a few blogs dedicated to Hijab wearing lolitas and these styles can also work for fairy kei ! ♥
I’ve noticed Sugarnoor seems to wear pastel jeans as opposed to tights under her dresses and skirts, so you could try this out too ! You could wear a pair of cute lose-fitting jeans, and maybe a skirt over the top to cover up any tightness around the top ! You could also wear pastel long sleeved tops underneath cute printed tops that a lot of shops sell, since most shops only sell short sleeved tops ;;
Another option is turtlenecks, which you could layer under t-shirts or wear under cute dresses ! Angelic Pretty make these most winters, and they come in some adorable designs ♥♥
You can also find similar designs on Taobao shops, by searching “长袖高领” and sifting through the results ! QuQ
You could also get some cute converse to cover up your ankle area if your jeans/leggings are a little shorter than you’d like, or any hi-tops !
If you’d prefer longer, more covering shoes, you could get a cute pair of boots ! Pink ugg style boots would be adorable, and lolita style boots would also work !
As for the sailor moon cosplay, you could wear the long sleeved seifuku version with the knee length skirt, with white jeans on perhaps ? Or you could edit this version to have long sleeves and a more covered chest ; it’d be a challenge, but I imagine it’d look amazing ! ; o ;
Since you could include the wand and the moon crescent on her forehead, it’d probably be obvious who you were cosplaying ! As the dress is floor length, it’d be super modest too c:
You can do it ! ♪
(If I’ve said anything that can’t be done, or made a mistake, please feel free to tell me ! Also if you wear a Hijab and have some tips, please send them in ! ♥)