I found this thread that basically explains why it happens:
@sandspider, you said you didn't notice the divots in the store but I'll ask this anyway....did you try on any other Eidos jackets of the same cut and if so, do you recall how they fit? I ask because I'm trying to sort out whether this Eidos cut is just not right for your shoulder or is the problem is specific to this particular jacket.
Funny thing is I'm looking at a jacket online right now that divots on the model wearing it but I have tried on no less than 20 Eidos, Isaia and Zenga jackets over the last week and none of them divot on me. My guess is the problem is the jacket and not the cut. I may buy it anyway hoping it fits me better than the model but I do have the option to return it. A return policy is a must.
@Salad read the post from JeffreyD but feel like in RTW market we are at the mercy of the company that designs and manufactures. This is a Primo model and the store did not have any other jackets in this model to try. I would not have bought the jacket if it was divoting like this in the store either that or I was too giddy from buying my first Eidos that I did not wear it long enough to notice. It's a shame because it's a really nice jacket sits really well on the neck and moves beautifully with you. I also tried the new Eidos model at Bloomindales it's a slim cut so had to size up but no divots on that model, the lapels are much slimmer in person though for the new model so holding off on buying it. Love the Eidos product now just have to find a model that works with my build.
I moved to Chicago recently and the tailor located on Oak street basically asked me to ignore the divots. The tailor seemed to think that if I sized up in the jacket it would be too loose everywhere else and might not be easy to take in that much cloth. So, given that discussion I feel like he is not up to the task of working on it.