Hello - US-based menswear designer looking for a white KNIT undershirt for luxury sector. Undershirt is worn underneath a shirt and therefore washed after one use, the neck has to be exceptionally made so it does not "pucker" or stretch out. Cotton has to have stretch, be form-fitting but not tight. Also has to be thin enough to be comfortable but not too thin where is falls apart after several bleach washings. I am looking for the ULTIMATE white undershirt, 100%. If your company manufacturers this, please contact us - thank you!