Hmm, given how little different the alternate costumes and alternate appearance packs were in comparison to default ones in ME2, the idea of large amount of differently looking, customizable and interchangle armors / parts sounded like too much work for the potential benefits it would bring from the start to me... But I admit, it was worth trying and fighting for. (:-/
Now, that we have been given more realistic outline... I think it is central to our (or at least my^_^) interests to emphasize, just like many posters did before me,...
... that if it is possible, we (I^_^) would really and I mean
really appreciate, if the alternate costumes were different from the the default ones.
In other words, it was nice that we had a chance to switch costumes in Mass Effect 2 at all...

(I am using my Miranda ilustration pics again lol:P)
... but given that people have different aesthetic preferences, that some of us would love to have more practical / militaristic versions of some of the costumes and that variety and diversity in general is a good and enriching thing ...
... I would love to see more different costumes which would cover wider range of desires and preferences - i.e. something like this:

or... at least like this...

No customization (different colours, materials, parts, etc.), no interchangability, no large amount of costumes is necessary. Just one nice little but significantly
different (especially in case of lightly armored / dressed squadmates / characters) costume for every squadmate and I would be happy.