Hello Kayla, thank you for supporting CosplayFU.
1.we take nothing wear under the costume, if you'd like, you can wear a under suit.
2.All the measure we recommend to measure your actual body size, if you don't like that, you can give costume size you want to us, but you need to leave a message to tell us, the size is the costume size you want, so that we can avoid the misunderstand. Ps. the costume size will take another 1-2 weeks to make.
3. This costume is made of polyester and it will take about 13-17 days to make, and fee by standard shipping (20-30 days shipping time), if you want to get the package more quickly, extra shipping fee will be needed.
**All the shipping information are shown on the package when you check out, and you can update your shipping method there.