Well, you don't really notice changes in the men's looks (because they all wear shirts and pants). With the woman's looks, you look at the shoes, the hair styling, the jackets, and everything else. The new dresses has made so strange choices so far (in my opinion), but, we'll see where the season takes us.

Heels, I can overlook. But those stiletto heels?! I can't walk, never mind run, in those – no idea how Stana does it (then again, you never see her feet in running sequences). 

Agreed, clothing choices for Beckett (I haven't seen ep 3, so I can't comment much on Ryan yet, but I saw the promo and thought Beckett's shirt was something that screamed… well even my mother won't wear that.) have been towards the point of awful this season, but I'm going to tolerate that since there's a new wardrobe guy, but he (or she) better find their his/her fast, because I miss the leather jackets and I don't know how much longer I can stand the clothes.

As for hair, Stana wanted long hair since season 1 but they'd film the pilot in short hair so they let her grew it out. Different, yeah, but whatever makes Stana happy is fine with me.

I think Beckett's evolution in wardrobe and hair is meant to show her in a more feminine light.  In the first season, we didn't know much about her other than the fact that she's a hard-nosed cop trying to avenge her mother's death.  As we see more layers of her personality, her wardrobe also becomes more varied.  Though I have to say, I haven't been a fan of this year's wardrobe much either.  I miss the leather jackets and well-fitted long coats too.  Regarding her shoes, Beckett has always worn heels, just not stilettos.  I kinda like them on her, even though it would make it very difficult for the average cop in reality.  At least they took a few minutes and poked fun at them last night. 

I actually haven't paid much attention to Martha's wardrobe, so I can't comment on that. 

Hmm Martha – perhaps we all don't notice her clothes because they are consistently loud and flashy, which hasn't changed.

MySafeWordisApples said:

I just like Stana's hair a lot better long…I think it suits her face better. But then again she could shave her head still be gorgeous!

Agreed! She always looked great, but I think she's at her best now with her long hair. So much more feminine. (just my personal taste, no offense to short-haired women).

Nev827 said:

I think Beckett's evolution in wardrobe and hair is meant to show her in a more feminine light.  In the first season, we didn't know much about her other than the fact that she's a hard-nosed cop trying to avenge her mother's death.  As we see more layers of her personality, her wardrobe also becomes more varied.  Though I have to say, I haven't been a fan of this year's wardrobe much either.  I miss the leather jackets and well-fitted long coats too.  Regarding her shoes, Beckett has always worn heels, just not stilettos.  I kinda like them on her, even though it would make it very difficult for the average cop in reality.  At least they took a few minutes and poked fun at them last night. 

I actually haven't paid much attention to Martha's wardrobe, so I can't comment on that. 

I agree that her wardrobe is a symbol for her own personal evolution; she's loosening up, letting people in and relaxing more.  She goes from suits to a more casual attire that make her more personable.  I love her outfits, no matter the season.  I prefer her hair longer, though I still loved it short.  I just think longer hair fits Stana better.  Then again, as MySafeWordisApples said, she could be shave her head and still be beautiful.  As for the heels, I think Stana is amazing; honestly, to be able to run around in those things all day long is a true feat.  If you have seen the behind the scenes feature on Season 2, you'd see that they took her heels down considerable from the first season.  Jon Huertas and Seamus Dever said that the change in heel height made Stana's gait smoother – I completely agree.  Three-inch heels were a bit much, yes?  I think they went down to either 2 1/2 or 2 inches.  I can't remember exactly.  I haven't looked to see if they kept this trend in Season 3.  Honestly, though, I think that the heels really do make Stana/Beckett look that much more intimidating as a cop and gives her that height advantage (whether Beckett wants to admit it or not, she likes the extra height).  The really accent her wonderfully built frame.

I applaud both her and the designers working constantly to find new stuff for her to wear to wow us and to make Beckett a dynamic character.