This has been slowly bothering me for awhile, moreso now that I've been seeing all your fantastic outfits on this forum =/

I work as an engineer at a company that designs, builds and tests satellites. My days are typically 8-10+ hours and most of that is usually spent on my feet. I love my job....but I am saddened by the fact that I used to dress better for school than I do right now.

I'm the only female in my group, and at 24, I'm the youngest by about 10 years. There is no dress code, per se. A couple guys wear dress shirts and khakis but most wear casual T's, polos, and slightly torn up jeans. The only die-hard rule is that all shoes must be closed toe for safety reasons. And no long or loose accessories that can get tangled up in equipment, etc. I pretty much stick to a watch, a small necklace and earrings.

For about a year now, my work outfits have consisted of jeans, a simple t-shirt and sneakers. About once a week or so (usually on fridays) I get so fed up with 'bumming' it all week that I'll slip into slacks and low heels and a nicer top. But I'd like to not have such a disparency between the two 'styles'...

I'm not sure what I'm really asking for here...except that I need suggestions for how to look polished and pulled together and still be comfortable enough to last all day. I've read the blog posts on smart-casual dressing...and think they might be a little too smart for this environment. I don't want to look like I'm trying too hard, especially since everyone else is so casual, but I don't want my clothes to make me look younger than I am, as its hard enough to get taken seriously when I'm the only girl and fresh out of school. But now that the summer heat is here....I'm finding I don't have very many tops that are work appropriate and still feminine and summery. Any tips would be greatly appreciated...and I'm sorry for this being so long-winded....