I think your items would sell, they are all super cute! I found
this site with similar shirts for you to compare prices a little. Your base cost has to include your materials, hourly wage and I usually add $2 for packaging/bus cards etc (I find it easier to tack on a few dollars to each piece so that I'm not drawing from my profits for these things...I want my profits to go to expanding my business).
Once you have your base cost, you do your markup. I markup anywhere from 2-5x, depending on what it is because I've learned what items people will pay more for. And then round it to an appealing #.
As for wholesale, if you are happy to get your base cost back, then make your markup 2x. Most places expect a 50% cut off the retail price. This is why it is SO important to make sure your base cost covers everything you put into it,not just the obvious. You won't make any real profit if you only mark it up 2x, just enough to make the item again...meaning you can't expand your inventory etc.
Items that I can't markup more then 2x, I don't sell to boutiques...it's not worth it to me. That being said, I find that the boutiques my work sells in, can sell more of my high end pieces then I can...it's all about venue! Selling wholesale also gives your work a new level of professionalism, and expands exposure of your work. I get a lot of referrals out of it. Just make sure any packaging has an email or web address.
Ok, now I feel like I'm rambling...there is just so much to it. I realize we are selling different items, but the profit has to be there regardless of what your selling, and if its not, don't do it!