With the economy still hovering on the verge of total disaster, fashionistas all around are wondering where exactly to invest their well-earned paychecks for the upcoming Fall 2010 season. From military looks, to knit on knit dressing, high heel hiking boots and handbags galore, here are five key pieces that will take you from September straight through to the holidays when you can start shopping guilt-free all over again!1) Stay Neutral - Camel, gray, beige or the latest€¦ grange (grayish beige) is THE hot hue for Fall. How about a fantastic swing coat for colder climates or a Derek Lam's sued wrap skirt? Whatever it is, this is a piece you will return to all season for a perfectly polished look.2) Wide Leg Trouser - Fit is KEY! And well worth the money spent. Trousers are instantly sexy when paired with a leather bomber or yummy silk blouse€¦ and a great choice for the office or a dinner date with friends.3) Knits are IT! This season it's all about mixing and matching your knits€¦ Chunky fisherman sweaters from Le Mont St Michel, Chloe cashmere swing skirts and even knit trimmed leather booties! Pile them all on together!4) The New Military - Army, or olive, green is the go to for Fall. Cargo pants€¦ and skirts, flak jackets, too. Anything that says Army is the way to go. Pop it with leopard print accessories and you'll have everyone standing at attention.5) Varsity Jackets - Reminiscent of the 1950's, a key trend for Fall, this look is back. You can find them for as cheap as $100 at stores like America Eagle Outfitters. Wear it with bad-girl looks like leather legging and schoolgirl mini skirts.