Help with new wardrobe

Once upon a time, I had a decent wardrobe. I did the whole growing up thing, finished college and started grad school, times changed and so did styles, and my wardrobe was no more. I'm a 5'10" and 135lbs male living in New England (aka warm and cold climates). While I have a few basic items, I'm starting from scratch with a lot. What I do have is high quality and fits me very well, that said, it isn't a lot. Few choice items I have:

Black Gucci wool blazer


Dark blue Burberry rain coat


Brown suede Gucci shoes


Selection of 7cm Hermes Ties


Numerous sweaters, including a few new ones


Several jeans, including this and similar washes


In addition, I have enough belts to sink a small ship, one or two shirts (off the shelf Brioni), maybe one pair of black dress pants, and plenty of sneakers / tees.

What I'm in need of, to begin with, are some dress shirts, a suit, couple dress paints, pair of black shoes, and what ever else would be a good idea. I'm extremely slender, so not much fits. I have about $2k to spend, and usually dress in jeans, shirt, sweater, and blazer for the winter (I'm in science, so no suits and ties), but obviously have to dress up once in a while. While I know what I like, I'm not really sure what's in style and where to get it from. Any suggestions on where to purchase from and what to purchase would be appreciated. I'll happily comment on any posted items to help narrow in my style. Thanks.

Thanks for the replies guys. The reindeer aren't my favorite part of this particular sweater, but like GoldenTribe pointed out, the detail on the stitching and clasps are what drew me in. The tie is hand rolled and stitched - I thought it looked odd as well until it was explained to me that it's normal.

I should say that these aren't the entire basis of my collection nor the summation of what I prefer - i.e. I don't exclusively own or like clasp knit sweaters. I just thought it might give some basis for recommendation instead of simply saying "I need a suit" with nothing about my style preferences to go on.