Most likely not out of financial reasonsAs these sizes has been non-returnable and made to order they have been safe sales for the brand, they have not had any risk of standing with an inventory that won't sell. As other sizes are also made to order, but still being returnable it cannot be the additional cost of making bras to order. As patterns already exist it cannot be a question of costs for creating patterns either. These sizes also had an additional charge of 20 zl placed upon the regular price for ordering them in non-regular sizes. Sizes made to order available on the drop down menu are both returnable and has no extra cost paid by the customer associated with them. This means that the sizes no longer produced should not be the least profitiable sizes sold. Because of that I'm personally quite sure this was a decision not made based on financial reasons.
Fit issues have been brought upIt is also unknown if this means withdrawal from this segment of the market completly or just temporarily. There has lately been some controversy at their Facebook page. FussyBusty posted a review mentioning problems with the straps being too far apart on her CHP Mak Nowa Koronka bra, which lead to the brand asking its customers on Facebook if more was having this problem or if this was an isolated incident. The response from well-meaning customers was massive with many wanting the straps closer together on their bras. The official judgement from the brand was in general that in the cases this was experiences the problem could be avoided with a bigger band and smaller cups, something the customers disagreed with publicly. The brand itself has called it a "Strapgate" and will post an answer at the official Ewa Michalak blog.
Hoping it's only temporarilyWhat I strongly do hope is that the withdrawal of the 50-60 bands is just temporarily, to give the brand some time to fix the fit issue many are experiencing. With the release of the S and the SM bra not all sizes were released at once, the smaller and larger cup sizes needed some more testing according to Ewa Michalak, but after that had been done they were also available. This is an excellent approach to ensure that all sizes hold up to the high standard the brand aspire. Grading, the practice to start with a sample size preferably in the middle of the size range and then change the pattern according to a set of rules to create the different sizes, usually causes the most issues in the outer-most sizes, so taking extra care to fit test the largest and smallest cup sizes before releasing them is definitly how thing should be done. The same thing however applies to the opposite direction too, to the smallest and largest band sizes, which it obviously hasn't.
As for now Ewa Michalak has gone from being one of the most inclusive brands in size range to not being on the bottom but far from the top. Their brand promise:
"Ewa Michalak is a bra brand that offers the widest range of sizes on earth :-) Bandsizes from 65 (30) to 100 (44), cupsizes from AA to LL (see the sizechart!). Any woman can find the perfect Ewa Michalak bra at affordable price, no matter how big or how small her bust is. " from http://www.ewa-michalak.pl/About-me-cabout-eng-3.html, see photo below.
surely does not apply anymore. A 28 band or smaller is not uncommon at all. For long Ewa Michalak has been the brand to go to for smaller framed women of all ages. I hope with all of my heart that Ewa Michalak will be going back to being that, just in an improved version. Because we need options.