Be thorough and accurate with your profile- make sure you've completed each question and section of the profile, including what colors you want to avoid. I realized I had not checked off red and brown and recently went back and did that. You can always alter your style profile, so be sure that the info is current and still true of your size and style. I looked back and saw I had checked "like it" for outfits I truly would never wear, and also realized after receiving a skin tight pair of jeans that hadn't changed my current jeans size :-).
Use ALL the space you are given for comments- There is space in your profile, at checkout, and when scheduling a new fix for comments, use all the space to convey what worked, what didn't, the overall style your looking to achieve, pieces you want.. the more you tell them the better!
Start a Pintrest board-pin often with outfits you love, style you envy, brands you like, and actual pieces from Stitch Fix you dig, and link the board to your Stitch Fix Profile (an important step)
Don't worry about offending anyone- Take your time checking out!! Be truthful, accurate, and yes, don't hold back..it won't help anyone. Obviously you'll be your kind selves, but this isn't the time to sugar coat or beat around the push (b/c that would be a waste of your $)..
When you find a stylist that gets you, request them again- When you go to request another Fix, if you are headed in the right direciton with a stylist, and they're starting to know you and your style, request them again!
Remember that the SF stylists are not mind readers- they are fashion forward humans..there is no easy formula, they hand-pick each item just for you. You've got to give them something to work with, ideas, direction, colors etc..
Be specific as you can- Give your stylist as much as you can to work with.. You can request specific items i.e. in my last fix I requested a maxi, cute pieces for vacation, and no accessory.. You can also request specific items you see on Stitch Fix's social media pages, and stylists do their best to accommodate.
When in doubt, Email firstname.lastname@example.org - Seriously, I have been truly impressed by the customer service at Stitch Fix, always helpful, friendly, and quick to respond. So if your having a problem, having bad luck with your fixes, or just have a question, I'd suggest an email.
Disclosure: Note that I am a Stitch Fix affiliate and if you shop through my links I will be compensated. But note I only affiliate with brands I love, and I was a big Stitch Fan long before. Thank you as always for your support!