You can totally do this.
First: support. Even if your friends are far away, you can ask them for help and advice. It may be beneficial to do a skype or other stream-chat where you can all work on costumes and chat in real time.
You can also reach out to your local cosplay community, see if local cons have their own facebook group or forums. Some areas have organized sew-alongs or may have makerspaces that support sewing.
There is also the extended cosplay community through tumblr, forum sites and facebook groups! If you need help with a specific costume, reach out to other people who have cosplayed her.
You can ask your local fabric store employees for assistance, they may be able to help you find a pattern or direct you to the perfect fabric!
There are a lot of resources out there to take advantage of!
Making It: It sounds like you are mostly intimidated by using your good fabric to make the costume. What you may find helpful is using muslin or another cheap fabric to mockup your design. This mockup can be cut up, re-sewn and adjusted however much you need to make it perfect and get the practice you need. Then use the mockup as your pattern for the final costume. It takes a lot of the heat off!
Commissions: If you really don’t want to make your costume, then commissioning is a good way to go.
Do your friends take commissions? If they do, then definitely ask them about it. If they don’t currently take commissions, you could still float the idea by them and see if they are interested. It can be very flattering to receive a commission request! That said, make sure your request is fair to them. Just because they are your friend doesn’t mean that you shouldn’t value their time, you should work with them to determine a fair rate of pay.
If your friends aren’t willing or able to take commissions you can look into commissioning someone else.
Pattern: You may find that terms like “jumpsuit” or “romper” yield more results. If the pattern has long pants you can always shorten them to shorts, which will give you more options. You may find a pattern that doesn’t have the right sleeves so check out these Puff Sleeve tutorials
Since your friends are making the same/similar outfits you may want to ask what patterns they are using. That way you can all be consistent!
Here are some patterns that may work for you:
M7115 Misses’ Button-Up Romper and Dresses
M7556 Cropped Sweatshirts and Princess-Seam Rompers
M6969 Misses’ Button-Front Rompers and Jumpsuits
M7167 Misses’ Wide-Leg Romper and Jumpsuits
B6548 Misses’ Jumpsuits
V9245 MISSES’/MISSES’ PETITE BUTTON-UP JUMPSUITS AND SASH
V1506 MISSES’ SLEEVELESS WIDE-LEG JUMPSUIT
V9075 MISSES’/MISSES’ PETITE GATHERED DRESS AND PLEATED JUMPSUIT
K4180 Misses’ Surplice, Blouson Jumpsuits and Sash
B6312 Misses’ V-Neck Dress and Jumpsuit
Hope this gives you some inspiration!