So, what falls under 14th century? The century saw clothing change from draped fabrics and straight seams to shaped garments with curved seams. Armor progressed from full suits of chain to full plate in one hundred years. There is a lot to choose from.
To begin with, Effigies and Brasses deserves its own mention. You can search by a range of years and filter by region, sex, and civilian/clergy/martial subjects to get a period representation of armor and fashion:
Effigies and Brasses
The following links explain 14th century fashion for men and women.
Wikipedia has a very good summary.
Rosalie Gilbert talks about women’s fashion, including lots of 14th C
Getting dressed in the 14th century (female), from Crow’s Eye Productions (video)
Getting dressed in the 14th century (male), from Crow’s Eye Productions (video)
Italian Renaissance 1300-1500
Head to toe 14th century woman
Fashion and clothing in the 14th century
A clothing dictionary
Katafalk has articles on 14th century from a classically trained tailor
La Cotte Simple has articles on 14th and 15th century clothing
Costumes and courtiers: garments and fashion ideas in late medieval Western Europe
Parti-colored clothes in 14th century Ireland
Kat’s Hats, examples of headwear and accessories
Morgan Donner’s How to Make Medieval Stockings!
From Cynehild Þegnestre’s Medieval Home Companion,
14th Century Men’s Clothing
14th Century Women’s Clothing
And here are some armoring resources.
This list would be incomplete without Knyght Errant
Dressing in armor (video)
A timeline of armor in effigies
Infantry tactics at the Battle of Crecy, 1346
The Facebook group XIV Century European Armor has a wealth of info, both period examples and modern reconstructions
The following links are to vendors. Their inclusion here is an incomplete list of commercial offerings, and they are included as a convenience, not as endorsement.
Historic Enterprises has 14th C clothing, complete outfit packages, headwear, footwear, and accessories.
Revival Clothing has clothing by time period, headwear, accessories, and footwear, with historic inspiration noted for most products.
Viking Leathercrafts has period footwear.
Reconstructing History has patterns for 14thC garb