Nicks are designed to be worn without underwear (no seams and the leather or synthetic chamois material "breathes" to avoid nasties.) Having said that, please wear your underwear whilst trying them on! Never wear your nicks more than once without washing them. (One ride, one wash - the consequences are not worth it!)
If you are doing a lot of riding, try owning a few different brands of nicks in order to have a slightly different size and shape chamois for different days.
Try a bib and brace set instead of nicks with a waistband - hmmm…comfort!
Jerseys are designed to be fairly well fitted - the bright colours are to make us more visible in traffic and the pockets come in very handy.
Jerseys are also designed to wick the perspiration away from the skin, to keep you more comfortable.
In winter, wearing a cotton Singlet under your jersey can actually make you colder, as cotton absorbs moisture and you will get very cold after you sweat. We stock special undershirts which keep the moisture away from your skin and are also designed to cover your lower back whilst bent over the handlebars.

Please ask for any advice you need!