Since I have no creative talent, and can't so anything for the life of me, I have to purchase my imperial officer uniform. I have found a site that actually sells a good majority of the costume, but I need to know if it is approved by the 501st Legion. Another site I found sells the boots and the gloves I need.
The Suit Site:
https://www.shadowdalecreations.com/imperial.htm
The Boots and Gloves Site:
https://www.imperialboots.com/
ImperialBoots.com is reputable - only issue is, they are based in China. So if something is wrong or off with the costume you ordered, it will take a long time for shipping to get it fixed. So if you order from there, triple check your measurements are good.
I did some research on ShadowDaleCreations on the Imperial Officer forums. Consensus is....steer clear.
If I can offer an alternative - a website many officer costumers have used is CosplaySky
https://cossky.com/products/star-wars-imperial-officer-uniform-costume-deluxe-version-new?_pos=4&_sid=fb226bf7e&_ss=rBoth my wife and I have Imperial officer uniforms from Cosplaysky - they required a little bit of tailoring but we are both very happy with them. It was the first 501st Legion costume I had and it's still holding up.
Additionally - CrowProps has done Imperial Officer boots in the past. If you need other accessories like belt, hat, rank bar, gloves, code cylinders - those can all be found on Etsy.
Final piece of advice - before you make any big ticket purchase and you want to be sure it's approvable, please contact a Garrison Membership Liaison (that would be me - I do the officer uniform approvals). I'd hate for you to drop big money on a part and it doesn't meet the 501st CRL standard.
Happy Hunting